Operating Segments and Related Information Operating Segments and Related Information (Details 6) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 970,654	$ 994,881
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	622,694	623,522
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	336,511	319,661
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 11,449	$ 51,698