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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 332,230	$ 371,327	$ 1,018,973	$ 1,138,850
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	185,222	205,579	536,150	598,236
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	61,507	87,647	231,374	279,341
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 85,501	$ 78,101	$ 251,449	$ 261,273