Net Revenues by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Information [Line Items]
Net revenues	$ 198,086	[1]	$ 180,646	[1]
United States
Segment Reporting Information [Line Items]
Net revenues	139,704	[1]	128,640	[1]
the Netherlands
Segment Reporting Information [Line Items]
Net revenues	38,645	[1]	37,391	[1]
Other international
Segment Reporting Information [Line Items]
Net revenues	$ 19,737	[1]	$ 14,615	[1]

[1] Net revenues are attributed to countries based on location of where revenue is recognized.