Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers	$ 289,017	$ 302,225	$ 280,606	$ 245,136	$ 243,817	$ 242,468	$ 225,577	$ 204,214	$ 1,116,984	$ 916,076	$ 743,183
Long-lived assets by geographic area	464,950				453,685				464,950	453,685	366,046
United States
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers									1,032,435	846,611	676,967
Long-lived assets by geographic area	442,673				425,585				442,673	425,585	345,153
Rest-of-World
Net revenues to external customers and long-lived assets located by geographic area
Net revenues to external customers									84,549	69,465	66,216
Long-lived assets by geographic area	$ 22,277				$ 28,100				$ 22,277	$ 28,100	$ 20,893