Operating Segments and Related Information (Details 6) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Business Unit Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 1,407,714	$ 1,401,806
United States
Business Unit Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	723,405	797,816
Europe [Member]
Business Unit Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	462,271	343,208
Other Geographic Region [Member]
Business Unit Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 222,038	$ 260,782