Segment Reporting Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 27,857	$ 26,431
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	2,356	(1,329)
Income Tax Expense (Benefit), Continuing Operations	118	(102)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,238	(1,227)
Water Activities [Member]
Segment Reporting Information [Line Items]
Revenues	26,582	25,226
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	1,703	(1,875)
Income Tax Expense (Benefit), Continuing Operations	(37)	(252)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,740	(1,623)
Real Estate Transactions [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	0	0
Income Tax Expense (Benefit), Continuing Operations	(12)	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	12	0
Services and Rentals [Member]
Segment Reporting Information [Line Items]
Revenues	1,275	1,205
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	653	546
Income Tax Expense (Benefit), Continuing Operations	167	150
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 486	$ 396

CONNECTICUT WATER SERVICE INC / CT 10-Q