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, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Current, federal $ 53,840 $ 61,211 $ 42,790
Current, state and local 6,370 6,520 3,175
Current, non-U.S. 18,708 21,014 20,679
Current income tax expense 78,918 88,745 66,644
Deferred, federal (12,921) (8,883) (5,147)
Deferred, state and local (2,166) (906) (739)
Deferred, non-U.S. (5,372) (11,488) (4,096)
Deferred income tax expense (20,459) (21,277) (9,982)
Income tax expense $ 58,459 $ 67,468 $ 56,662