Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory provision									$ 44,596	$ 77,671	$ 70,627
State and local income taxes									1,251	5,418	7,188
Impact of foreign operations taxed at rates other than the U.S. statutory rate									(1,988)	(15,859)	(9,236)
Accrual/release of uncertain tax amounts related to foreign operations									(4,595)	(17,919)	(7,482)
U.S. tax impacts of foreign income in the U.S.									7,683	2,778	2,929
Tax exempt income/reimbursement									0	0	(935)
Tax incentives/credits/exempt income									2,026	(14,329)	(9,020)
Goodwill impairments									0	0	50,003
Remeasurement of U.S. deferred taxes									(13,121)	(129,960)	0
U.S. tax on unremitted earnings									(23,711)	90,916	0
Other, net									242	1,837	2,901
Total provision for income taxes	$ (8,362)	$ (1,976)	$ 6,458	$ 16,263	$ (38,147)	$ 10,828	$ 790	$ 27,082	12,383	553	106,975
Tax uncertainties									$ (9,000)	$ (3,000)	$ (3,000)