Operating Segments and Related Information Operating Segments and Related Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 375,366	$ 358,141	$ 1,096,288	$ 1,096,053
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	192,049	191,261	544,895	576,278
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	81,438	81,748	262,282	260,474
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 101,879	$ 85,132	$ 289,111	$ 259,301