Supplemental Guarantors Consolidating Condensed Financial Information - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions
REVENUE	$ 22,195	$ 24,013	$ 54,008	$ 68,308
EXPENSES:
Depreciation and amortization	10,130	17,714	28,522	61,946
Impairment of goodwill	0	0	4,496	0
Cost of sales	7	31	112	74
Selling, general and administrative	10,855	5,049	21,369	15,700
Total operating expenses	20,992	22,794	54,499	77,720
INCOME (LOSS) FROM OPERATIONS	1,203	1,219	(491)	(9,412)
Interest income (expense), net	(5,984)	(6,139)	(18,070)	(18,536)
Foreign currency exchange gains (losses)	(238)	(3)	874	(88)
Other income	13	0	85	96
Dividend income from subsidiary	0		0
Loss before income taxes	(5,006)	(4,923)	(17,602)	(27,940)
Provision (benefit) for income taxes	(286)	1,421	(1,168)	1,419
Equity in income of subsidiaries	0	0	0	0
NET LOSS	(4,720)	(6,344)	(16,434)	(29,359)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions
REVENUE	(322)	(540)	(1,248)	(1,482)
EXPENSES:
Depreciation and amortization	0	0	0	(25)
Impairment of goodwill			0
Cost of sales	0	(214)	(283)	(504)
Selling, general and administrative	(322)	(326)	(965)	(978)
Total operating expenses	(322)	(540)	(1,248)	(1,507)
INCOME (LOSS) FROM OPERATIONS	0	0	0	25
Interest income (expense), net	0	0	0	0
Foreign currency exchange gains (losses)	0	0	0	0
Other income	0		0	0
Dividend income from subsidiary	(23,062)		(23,062)
Loss before income taxes	(23,062)	0	(23,062)	25
Provision (benefit) for income taxes	0	0	0	0
Equity in income of subsidiaries	(2,214)	(4,904)	(704)	5,989
NET LOSS	(25,276)	(4,904)	(23,766)	6,014
Parent [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions
REVENUE	0	0	0	0
EXPENSES:
Depreciation and amortization	0	0	0	0
Impairment of goodwill			0
Cost of sales	0	0	0	0
Selling, general and administrative	237	169	497	429
Total operating expenses	237	169	497	429
INCOME (LOSS) FROM OPERATIONS	(237)	(169)	(497)	(429)
Interest income (expense), net	(6,461)	(6,046)	(19,079)	(17,959)
Foreign currency exchange gains (losses)	0	0	0	0
Other income	0		0	0
Dividend income from subsidiary	0		0
Loss before income taxes	(6,698)	(6,215)	(19,576)	(18,388)
Provision (benefit) for income taxes	0	0	0	0
Equity in income of subsidiaries	1,978	(129)	3,142	(10,971)
NET LOSS	(4,720)	(6,344)	(16,434)	(29,359)
Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions
REVENUE	19,783	13,148	48,272	46,241
EXPENSES:
Depreciation and amortization	8,489	14,011	21,952	48,493
Impairment of goodwill			2,518
Cost of sales	7	244	339	571
Selling, general and administrative	9,951	3,916	18,604	12,553
Total operating expenses	18,447	18,171	43,413	61,617
INCOME (LOSS) FROM OPERATIONS	1,336	(5,023)	4,859	(15,376)
Interest income (expense), net	448	(142)	761	(608)
Foreign currency exchange gains (losses)	0	(2)	(1)	0
Other income	13		63	0
Dividend income from subsidiary	23,062		23,062
Loss before income taxes	24,859	(5,167)	28,744	(15,984)
Provision (benefit) for income taxes	55	(5)	102	(6)
Equity in income of subsidiaries	236	5,033	(2,438)	4,982
NET LOSS	25,040	(129)	26,204	(10,996)
Non-Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions
REVENUE	2,734	11,405	6,984	23,549
EXPENSES:
Depreciation and amortization	1,641	3,703	6,570	13,478
Impairment of goodwill			1,978
Cost of sales	0	1	56	7
Selling, general and administrative	989	1,290	3,233	3,696
Total operating expenses	2,630	4,994	11,837	17,181
INCOME (LOSS) FROM OPERATIONS	104	6,411	(4,853)	6,368
Interest income (expense), net	29	49	248	31
Foreign currency exchange gains (losses)	(238)	(1)	875	(88)
Other income	0		22	96
Dividend income from subsidiary	0		0
Loss before income taxes	(105)	6,459	(3,708)	6,407
Provision (benefit) for income taxes	(341)	1,426	(1,270)	1,425
Equity in income of subsidiaries	0	0	0	0
NET LOSS	$ 236	$ 5,033	$ (2,438)	$ 4,982

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