Operating Segments and Related Information Operating Segments and Related Information (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,014,138	$ 991,466
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	596,967	583,008
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	362,959	355,497
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 54,212	$ 52,961