Segment Information - Disaggregation of Revenue By Geographical Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues, net	$ 184,063	$ 253,420
Domestic
Segment Reporting Information [Line Items]
Revenues, net	181,015	245,703
Foreign
Segment Reporting Information [Line Items]
Revenues, net	$ 3,048	$ 7,717
Geographic Concentration Risk | Net Revenue
Segment Reporting Information [Line Items]
Concentration risk percentage	100.00%	100.00%
Geographic Concentration Risk | Net Revenue | Domestic
Segment Reporting Information [Line Items]
Concentration risk percentage	98.30%	97.00%
Geographic Concentration Risk | Net Revenue | Foreign
Segment Reporting Information [Line Items]
Concentration risk percentage	1.70%	3.00%