Income Taxes Schedule of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	$ 7,679	$ 20,490	$ 5,033
State and local	3,841	2,708	1,633
Foreign	12,139	12,586	13,945
Total current	23,659	35,784	20,611
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	40,340	10,805	3,951
State and local	(1,144)	1,160	(972)
Foreign	3,480	(24,815)	(41,893)
Total deferred	42,676	(12,850)	(38,914)
Change in valuation allowance	7,991	26,640	40,402
Total provision for income taxes	$ 74,326	$ 49,574	$ 22,099