Operating Segments and Related Information (Details 6) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,067,102	$ 1,063,457
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	664,989	666,759
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	388,126	383,501
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 13,987	$ 13,197