Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Goodwill and Impairment of Long-Lived Assets (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) reporting_unit	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 849	$ 2,300	$ 2,940	$ 3,306	$ 2,940
Number of reporting units | reporting_unit				2
Goodwill	25,784			$ 25,784		$ 25,859
Water Management
Goodwill [Line Items]
Goodwill	$ 25,800			$ 25,800
Reporting unit, percentage of fair value in excess of carrying amount	17.00%			17.00%