Income Taxes (Income Tax Reconciliation) (Details 3) - 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 Taxes [Line Items]
U.S. Federal taxes at statutory rate									$ 67,937	$ 63,976	$ 87,731
State and local taxes, net of U.S. Federal tax									(1,279)	6,949	(2,965)
Stock based compensation				$ 1,800				$ 5,900	(1,731)	(6,023)	0
Goodwill impairments and dispositions									0	0	(5,631)
U.S. Federal Manufacturing Deducation tax benefits									0	(1,329)	(6,012)
Write-off of deferred taxes related to intercompany loans									0	0	10,965
Deferred tax impact of U.S. Federal tax rate reduction to 21%, net of state tax impact									0	(153,336)	0
Deferred tax benefit on unremitted non-U.S. subsidiary earnings									0	(28,324)	0
Other, net									1,618	1,268	6,604
Total provision for income tax	$ 12,400	$ 10,000	$ 16,100	$ 13,600	$ (159,700)	$ 13,400	$ 23,900	$ 2,700	52,100	(119,700)	81,200
State [Member]
Income Taxes [Line Items]
Valuation allowance against tax benefits									(15,767)	(946)	3,196
non-U.S. [Member]
Income Taxes [Line Items]
Valuation allowance against tax benefits									$ 1,322	$ (1,935)	$ (12,688)