Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current tax expense:
Current Federal Tax Expense (Benefit)	$ (729)	$ 96	$ (1,077)
Current State and Local Tax Expense (Benefit)	86	444	777
Current Foreign Tax Expense (Benefit)	6,963	8,375	8,036
Current income tax expense (benefit)	6,320	8,915	7,736
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	(12,253)	(3,970)	4,478
Deferred State and Local Income Tax Expense (Benefit)	(1,173)	(938)	62
Deferred Foreign Income Tax Expense (Benefit)	(808)	(1,402)	(2,477)
Deferred income tax expense (benefit):	(14,234)	(6,310)	2,063
Provision (benefit) for income taxes	$ (7,914)	$ 2,605	9,799
Tax Cuts and Jobs Act, Measurement Period Adjustment, Deferred Tax Revaluation, Income Tax Expense (Benefit)			1,300
Tax Cuts and Jobs Act, Measurement Period Adjustment, Foreign Items, Income Tax Expense (Benefit)			(400)
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)			$ (31,000)