Operating Segments and Related Information Operating Segments and Related Information (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 882,020	$ 881,390
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	579,612	587,592
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	292,570	284,171
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 9,838	$ 9,627