Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory provision									$ 5,700	$ 39,505	$ 67,794
State and local income taxes									(868)	1,292	3,739
Impact of foreign operations taxed at rates other than the U.S. statutory rate (2)									(18,541)	(2,483)	(12,054)
Accrual/release of uncertain tax amounts related to foreign operations									191	(4,595)	(17,919)
U.S. tax impacts of foreign income in the U.S.									5,587	5,854	1,750
Tax incentives/credits/exempt income									(5,437)	3,526	(14,587)
Unrealized stock compensation benefits									2,176	1,941	3,778
Remeasurement of U.S. deferred taxes									0	(13,121)	(108,176)
U.S. tax on unremitted earnings									0	(23,711)	90,916
Other, net (3)									(1,815)	(1,792)	(1,582)
(Benefit) provision for income taxes	$ 344	$ (24,895)	$ 3,724	$ 7,820	$ (10,819)	$ (2,468)	$ 2,205	$ 17,498	(13,007)	6,416	13,659
Tax uncertainties									(3,000)	$ (9,000)	$ (3,000)
Change in deferred tax assets valuation allowance									(23,000)
Tax on Market Exits									3,000
Interest									$ 1,000