Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	1
Net revenue	$ 126,516	$ 177,235
Percentage of revenue by geographic segments	100.00%	100.00%
Long-lived assets	1,408,787		1,227,284
Percentage of long-lived assets by geographic segments	100.00%		100.00%
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	120,764	167,480
Percentage of revenue by geographic segments	95.50%	94.50%
Long-lived assets	1,400,153		1,218,370
Percentage of long-lived assets by geographic segments	99.40%		99.30%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	5,090	8,719
Percentage of revenue by geographic segments	4.00%	4.90%
Long-lived assets	8,634		8,899
Percentage of long-lived assets by geographic segments	0.60%		0.70%
Rest of world [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	662	1,036
Percentage of revenue by geographic segments	0.50%	0.60%
Long-lived assets	$ 0		$ 15
Percentage of long-lived assets by geographic segments	0.00%		0.00%