Operating Segments and Related Information (Details 6) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 986,647	$ 994,881
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	629,235	623,522
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	344,667	319,661
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 12,745	$ 51,698