Business Combinations - Pro-forma Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Revenues	$ 539,163	$ 500,882
Net income (loss)	(59,339)	(30,811)
Grace acquisition
Business Acquisition [Line Items]
Revenues	388,700
Net income (loss)	(16,500)
Acquisition and transaction related costs	39,700
Pro Forma | Grace acquisition
Business Acquisition [Line Items]
Management fees	900	5,200
Depreciation and amortization	10,700	15,400
Interest expense	$ 8,800	$ 30,000