Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense:
Current Federal Tax Expense (Benefit)	$ 96	$ (1,077)	$ 1,744
Current State and Local Tax Expense (Benefit)	444	777	2,101
Current Foreign Tax Expense (Benefit)	8,375	8,036	9,421
Current income tax expense (benefit)	8,915	7,736	13,266
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	(3,970)	4,478	(44,456)
Deferred State and Local Income Tax Expense (Benefit)	(938)	62	(1,036)
Deferred Foreign Income Tax Expense (Benefit)	(1,402)	(2,477)	5,471
Deferred income tax expense (benefit):	(6,310)	2,063	(40,021)
Provision (benefit) for income taxes	$ 2,605	9,799	(26,755)
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)			$ (31,900)
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)