Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments			1
Net revenue	$ 183,774	$ 172,826	$ 361,009	$ 328,579
Percentage of revenue by geographic segments	100.00%	100.00%	100.00%	100.00%
Long-lived assets	1,242,521		1,242,521		1,148,267
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	172,898	159,590	340,377	303,786
Percentage of revenue by geographic segments	94.10%	92.30%	94.30%	92.50%
Long-lived assets	1,231,663		1,231,663		1,139,210
Percentage of long-lived assets by geographic segments	99.10%		99.10%		99.20%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	9,790	10,698	18,509	21,083
Percentage of revenue by geographic segments	5.30%	6.20%	5.10%	6.40%
Long-lived assets	10,841		10,841		9,035
Percentage of long-lived assets by geographic segments	0.90%		0.90%		0.80%
Rest of world [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	1,086	2,538	2,123	3,710
Percentage of revenue by geographic segments	0.60%	1.50%	0.60%	1.10%
Long-lived assets	$ 17		$ 17		$ 22
Percentage of long-lived assets by geographic segments	0.00%		0.00%		0.00%