Segment and Geographic Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment			1
Net revenue	$ 90,472	$ 183,774	$ 216,988	$ 361,009
Percentage of revenue by geographic segments	100.00%	100.00%	100.00%	100.00%
Long-lived assets	$ 1,406,185		$ 1,406,185		$ 1,227,284
Percentage of long-lived assets by geographic segments	100.00%		100.00%		100.00%
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 85,261	$ 172,898	$ 206,025	$ 340,377
Percentage of revenue by geographic segments	94.20%	94.10%	94.90%	94.30%
Long-lived assets	$ 1,397,423		$ 1,397,423		$ 1,218,370
Percentage of long-lived assets by geographic segments	99.40%		99.40%		99.30%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 4,547	$ 9,790	$ 9,637	$ 18,509
Percentage of revenue by geographic segments	5.00%	5.30%	4.40%	5.10%
Long-lived assets	$ 8,762		$ 8,762		$ 8,899
Percentage of long-lived assets by geographic segments	0.60%		0.60%		0.70%
Rest of world [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 664	$ 1,086	$ 1,326	$ 2,123
Percentage of revenue by geographic segments	0.80%	0.60%	0.70%	0.60%
Long-lived assets	$ 0		$ 0		$ 15
Percentage of long-lived assets by geographic segments	0.00%		0.00%		0.00%