Segment Information Items Provided to CODM (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Tangible property, equipment and software capitalization, net	$ 82,039		$ 41,415
Percentage of property and equipment, net, minimum for disclosure	10.00%
Depreciation and amortization	55,801		32,055		12,952
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	95,836		43,811		14,681
Equity Method Investments	1,734		50,604
North America [Member]
Segment Reporting Information [Line Items]
Tangible property, equipment and software capitalization, net	44,539	[1]	18,727	[1]
Depreciation and amortization	30,580		10,515		1,440
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	38,028		19,452		10,898
Equity Method Investments	1,734	[2]	1,209	[2]
International [Member]
Segment Reporting Information [Line Items]
Tangible property, equipment and software capitalization, net	37,500	[3]	22,688	[3]
Depreciation and amortization	25,221		21,540		11,512
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	57,808		24,359		3,783
Equity Method Investments	$ 0	[4]	$ 49,395	[4]
Germany [Member]
Segment Reporting Information [Line Items]
Percentage of property and equipment, net	12.00%		11.00%
Switzerland [Member]
Segment Reporting Information [Line Items]
Percentage of property and equipment, net	11.00%

[1] Substantially all tangible property and equipment that is included in North America are located in the United States.

[2] All equity method investments included in North America are located in the United States.

[3] Tangible property and equipment, net located within Germany represented approximately 12% and 11% of the Company's consolidated tangible property and equipment, net as of December 31, 2012 and 2011, respectively. Tangible property and equipment, net located within Switzerland represented approximately 11% of the Company's consolidated tangible property and equipment, net as of December 31, 2012. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net at December 31, 2012 and 2011.

[4] All equity method investments included in International are held by an entity in the Netherlands.