Income Taxes (Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal income taxes:
Current	$ 13,928	$ 5,801	$ 3,437
Deferred	(3,803)	(3,541)	(1,924)
Federal Income Tax Expense (Benefit), Continuing Operations, Total	10,125	2,260	1,513
State income taxes:
Current	3,337	2,764	683
Deferred	(2,269)	(1,792)	684
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	1,068	972	1,367
Foreign income taxes:
Current	(11,545)	5,302	5,643
Deferred	18,310	(630)	(1,134)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	6,765	4,672	4,509
Total provision for income taxes	$ 17,958	$ 7,904	$ 7,389