Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segment	Jun. 30, 2012	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments			1
Net revenue	$ 172,826	$ 135,702	$ 328,579	$ 262,312
Percentage of revenue by geographic segments	100.00%	100.00%	100.00%	100.00%
Long-lived assets	645,725		645,725		162,800
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	159,590	123,774	303,786	239,753
Percentage of revenue by geographic segments	92.30%	91.20%	92.50%	91.40%
Long-lived assets	643,700		643,700		161,909
Percentage of long-lived assets by geographic segments	99.70%		99.70%		99.40%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	10,698	9,656	21,083	18,812
Percentage of revenue by geographic segments	6.20%	7.10%	6.40%	7.20%
Long-lived assets	1,124		1,124		743
Percentage of long-lived assets by geographic segments	0.20%		0.20%		0.50%
Rest of world [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	2,538	2,272	3,710	3,747
Percentage of revenue by geographic segments	1.50%	1.70%	1.10%	1.40%
Long-lived assets	$ 901		$ 901		$ 148
Percentage of long-lived assets by geographic segments	0.10%		0.10%		0.10%