Segment Information - Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 651,634	$ 578,165	$ 544,135	$ 714,718	$ 458,706	$ 413,783	$ 431,608	$ 398,080	$ 2,488,652	$ 1,702,177	$ 1,032,336
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,986,786	1,321,807	763,316
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									420,317	320,456	219,596
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									81,549	59,914	49,424
Total revenues outside of the United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 501,866	$ 380,370	$ 269,020