Operating Segments and Related Information (Details 6) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,081,551	$ 1,063,457
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	693,580	666,759
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	373,385	383,501
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 14,586	$ 13,197