Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers	$ 346,363	$ 329,950	$ 322,802	$ 289,403	$ 289,017	$ 302,225	$ 280,606	$ 245,136	$ 1,288,519	$ 1,116,984	$ 916,076
Long-lived assets by geographic area	478,421				464,950				478,421	464,950	453,685
United States
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers									1,180,759	1,032,435	846,611
Long-lived assets by geographic area	462,377				442,673				462,377	442,673	425,585
Rest-of-World
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers									107,760	84,549	69,465
Long-lived assets by geographic area	$ 16,044				$ 22,277				$ 16,044	$ 22,277	$ 28,100