Operating Segments and Related Information Operating Segments and Related Information (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 891,205	$ 881,390
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	582,645	587,592
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	298,699	284,171
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 9,861	$ 9,627