Segment Information Segment Information - Financial Information by Geographical Area (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	$ 9,071,532	$ 8,868,324	$ 8,627,912
Long-Lived Assets	306,812	293,887	159,939
United States
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	8,688,018	8,731,484	8,627,912
Long-Lived Assets	170,010	162,333	159,939
United Kingdom
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	211,296	86,332	0
Long-Lived Assets	42,619	40,609	0
France
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	52,725	14,338	0
Long-Lived Assets	7,090	7,960	0
Germany
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	42,807	13,670	0
Long-Lived Assets	60,068	54,826	0
Other European countries
Segment And Geographic Distribution Of Operations [Line Items]
Net revenue	76,686	22,500	0
Long-Lived Assets	$ 27,025	$ 28,159	$ 0