Annual report pursuant to Section 13 and 15(d)

Income Taxes (Components of Provision (Benefit) for Income Taxes) (Details)

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Income Taxes (Components of Provision (Benefit) for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current, federal $ 87,386 $ 53,840 $ 61,211
Current, state and local 443 6,370 6,520
Current, non-U.S. 28,708 18,708 21,014
Current income tax expense 116,537 78,918 88,745
Deferred, federal 47,087 (12,921) (8,883)
Deferred, state and local 4,990 (2,166) (906)
Deferred, non-U.S. (14,195) (5,372) (11,488)
Deferred income tax expense 37,882 (20,459) (21,277)
Income tax expense $ 154,419 $ 58,459 $ 67,468