Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net revenues to external customers and long-lived assets located by geographic area
Total revenues	$ 404,875	$ 386,221	$ 347,161	$ 327,504	$ 346,363	$ 329,950	$ 322,802	$ 289,403	$ 1,465,761	$ 1,288,519	$ 1,116,984
Long-lived assets by geographic area	495,774				478,421				495,774	478,421
United States
Net revenues to external customers and long-lived assets located by geographic area
Total revenues									1,353,002	1,180,759	1,032,435
Long-lived assets by geographic area	481,219				462,377				481,219	462,377
Rest-of-World
Net revenues to external customers and long-lived assets located by geographic area
Total revenues									112,759	107,760	$ 84,549
Long-lived assets by geographic area	$ 14,555				$ 16,044				$ 14,555	$ 16,044