Summary of Significant Accounting Policies (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Balance			$ 78,011	$ 78,011
Goodwill Impairment	$ (81,900)	$ (34,700)	(81,900)	(81,877)	$ (34,703)
Balance		78,011			78,011
Completion and Remedial Services
Goodwill [Line Items]
Balance			$ 78,011	78,011
Goodwill additions				3,866
Goodwill Impairment				$ (81,877)
Balance		$ 78,011			$ 78,011