13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consodlidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 137,343	$ 124,441
Proceeds from Sale of Property, Plant, and Equipment	0	123,545
Investments in real estate – development	(301,504)	(101,867)
Payments to Acquire Real Estate	(12,250)	0
Land acquisition costs - related party	0	(20,168)
Interest capitalized for real estate under development	(8,895)	(6,118)
Improvements to real estate	(418)	(3,098)
Additions to non-real estate property	(196)	(426)
Net cash used in investing activities	(323,263)	(8,132)
Proceeds	282,432	60,000
Repayments of Lines of Credit	0	(60,000)
Repayments of Secured Debt	(3,750)	(1,250)
Payments of financing Costs	110	96
Issuance of common stock, net of offering costs	0	275,720
Proceeds from Issuance of Redeemable Preferred Stock	0	194,502
Payments for Repurchase of Redeemable Preferred Stock	0	(251,250)
Equity compensation (payments) proceeds	(4,041)	8,285
Net cash provided by financing activities	178,421	129,497
Net increase (decrease) in cash and cash equivalents	(7,499)	245,806
Cash and cash equivalents, beginning	38,624	31,230
Cash and cash equivalents, ending	31,125	277,036
DuPont Fabros Technology, L.P. [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net cash (used in) provided by operating activities before return on investment in subsidiaries	137,343
Return on investment in subsidiaries	0
Net Cash Provided by (Used in) Operating Activities	137,343	124,441
Proceeds from Sale of Property, Plant, and Equipment	0	123,545
Investments in real estate – development	(301,504)	(101,867)
Payments to Acquire Real Estate	(12,250)	0
Land acquisition costs - related party	0	(20,168)
Investments in affiliates	0	0
Interest capitalized for real estate under development	8,895	6,118
Improvements to real estate	(418)	(3,098)
Additions to non-real estate property	(196)	(426)
Net cash used in investing activities	(323,263)	(8,132)
Proceeds	282,432	60,000
Repayments of Lines of Credit	0	(60,000)
Repayments of Secured Debt	(3,750)	(1,250)
Payments of financing Costs	110	96
Issuance of common stock, net of offering costs	0	275,720
Proceeds from Issuance of Redeemable Preferred Stock	0	194,502
Payments for Repurchase of Redeemable Preferred Stock	0	(251,250)
Equity compensation (payments) proceeds	(4,041)	8,285
Proceeds from Contributions from Parent	0
Distribution to parent	0
Distributions	(96,110)	(96,414)
Net cash provided by financing activities	178,421	129,497
Net increase (decrease) in cash and cash equivalents	(7,499)	245,806
Cash and cash equivalents, beginning	34,409	27,015
Cash and cash equivalents, ending	26,910	272,821
DuPont Fabros Technology, L.P. [Member] \| Operating Partnership [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net cash (used in) provided by operating activities before return on investment in subsidiaries	(38,620)
Return on investment in subsidiaries	175,963
Net Cash Provided by (Used in) Operating Activities	137,343	(30,954)
Proceeds from Sale of Property, Plant, and Equipment		0
Investments in real estate – development	0	(452)
Payments to Acquire Real Estate	0
Land acquisition costs - related party		0
Investments in affiliates	(330,131)	146,000
Interest capitalized for real estate under development	0	2
Improvements to real estate	0	0
Additions to non-real estate property	(127)	(200)
Net cash used in investing activities	(330,258)	145,346
Proceeds	282,432	60,000
Repayments of Lines of Credit		(60,000)
Repayments of Secured Debt	0	0
Payments of financing Costs	85	71
Issuance of common stock, net of offering costs		275,720
Proceeds from Issuance of Redeemable Preferred Stock		194,502
Payments for Repurchase of Redeemable Preferred Stock		(251,250)
Equity compensation (payments) proceeds	(4,041)	8,285
Proceeds from Contributions from Parent	0
Distribution to parent	0
Distributions	(96,110)	(96,414)
Net cash provided by financing activities	182,196	130,772
Net increase (decrease) in cash and cash equivalents	(10,719)	245,164
Cash and cash equivalents, beginning	31,781	21,697
Cash and cash equivalents, ending	21,062	266,861
DuPont Fabros Technology, L.P. [Member] \| Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net cash (used in) provided by operating activities before return on investment in subsidiaries	125,715
Return on investment in subsidiaries	0
Net Cash Provided by (Used in) Operating Activities	125,715	120,759
Proceeds from Sale of Property, Plant, and Equipment		120,086
Investments in real estate – development	(168,677)	(43)
Payments to Acquire Real Estate	0
Land acquisition costs - related party		0
Investments in affiliates	0	(237,391)
Interest capitalized for real estate under development	2,383	123
Improvements to real estate	(401)	(3,098)
Additions to non-real estate property	(33)	(190)
Net cash used in investing activities	(171,494)	(120,759)
Proceeds	0	0
Repayments of Lines of Credit		0
Repayments of Secured Debt	0	0
Payments of financing Costs	0	0
Issuance of common stock, net of offering costs		0
Proceeds from Issuance of Redeemable Preferred Stock		0
Payments for Repurchase of Redeemable Preferred Stock		0
Equity compensation (payments) proceeds	0	0
Proceeds from Contributions from Parent	171,494
Distribution to parent	125,715
Distributions	0	0
Net cash provided by financing activities	45,779	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning	0	0
Cash and cash equivalents, ending	0	0
DuPont Fabros Technology, L.P. [Member] \| Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net cash (used in) provided by operating activities before return on investment in subsidiaries	50,248
Return on investment in subsidiaries	0
Net Cash Provided by (Used in) Operating Activities	50,248	34,636
Proceeds from Sale of Property, Plant, and Equipment		3,459
Investments in real estate – development	(132,827)	(101,372)
Payments to Acquire Real Estate	(12,250)
Land acquisition costs - related party		(20,168)
Investments in affiliates	0	91,391
Interest capitalized for real estate under development	6,512	5,993
Improvements to real estate	(17)	0
Additions to non-real estate property	(36)	(36)
Net cash used in investing activities	(151,642)	(32,719)
Proceeds	0	0
Repayments of Lines of Credit		0
Repayments of Secured Debt	(3,750)	(1,250)
Payments of financing Costs	25	25
Issuance of common stock, net of offering costs		0
Proceeds from Issuance of Redeemable Preferred Stock		0
Payments for Repurchase of Redeemable Preferred Stock		0
Equity compensation (payments) proceeds	0	0
Proceeds from Contributions from Parent	158,637
Distribution to parent	50,248
Distributions	0	0
Net cash provided by financing activities	104,614	(1,275)
Net increase (decrease) in cash and cash equivalents	3,220	642
Cash and cash equivalents, beginning	2,628	5,318
Cash and cash equivalents, ending	5,848	5,960
DuPont Fabros Technology, L.P. [Member] \| Eliminations [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net cash (used in) provided by operating activities before return on investment in subsidiaries	0
Return on investment in subsidiaries	(175,963)
Net Cash Provided by (Used in) Operating Activities	(175,963)	0
Proceeds from Sale of Property, Plant, and Equipment		0
Investments in real estate – development	0	0
Payments to Acquire Real Estate	0
Land acquisition costs - related party		0
Investments in affiliates	330,131	0
Interest capitalized for real estate under development	0	0
Improvements to real estate	0	0
Additions to non-real estate property	0	0
Net cash used in investing activities	330,131	0
Proceeds	0	0
Repayments of Lines of Credit		0
Repayments of Secured Debt	0	0
Payments of financing Costs	0	0
Issuance of common stock, net of offering costs		0
Proceeds from Issuance of Redeemable Preferred Stock		0
Payments for Repurchase of Redeemable Preferred Stock		0
Equity compensation (payments) proceeds	0	0
Proceeds from Contributions from Parent	(330,131)
Distribution to parent	(175,963)
Distributions	0	0
Net cash provided by financing activities	(154,168)	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning	0	0
Cash and cash equivalents, ending	$ 0	$ 0

DUPONT FABROS TECHNOLOGY, INC. 10-Q