Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory provision									$ (38,836)	$ 5,700	$ 39,505
State and local income taxes									1,143	(868)	1,292
Impact of foreign operations taxed at rates other than the U.S. statutory rate									(3,345)	(18,541)	(2,483)
Accrual/release of uncertain tax amounts related to foreign operations									1,802	191	(4,595)
U.S. tax impacts of foreign income in the U.S.									(2,300)	5,587	5,854
CARES Act carryback benefit									(1,646)	0	0
Tax incentives/credits/exempt income									(750)	(5,437)	3,526
Unrealized stock compensation benefits									2,312	2,176	1,941
Surrender of company-owned life insurance policies									10,313	0	0
Goodwill impairment									40,328	0	0
Remeasurement of U.S. deferred taxes									0	0	(13,121)
U.S. tax on unremitted earnings									0	0	(23,711)
Other, net									(2,294)	(1,815)	(1,792)
Provision (benefit) for income taxes	$ (813)	$ 554	$ 17,016	$ (10,030)	$ 344	$ (24,895)	$ 3,724	$ 7,820	6,727	(13,007)	6,416
Surrender for company-owned life insurance policies									2,000
Tax uncertainties											$ (9,000)
Change in deferred tax assets valuation allowance									(3,000)	(23,000)
Tax on Market Exits									2,000	$ 3,000
Tax correction									2,000
Interest									$ 1,000