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Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income from continuing operations before income taxes        
Domestic [1]   $ 93,365 $ 30,804 $ 27,599
Foreign [1]   78,947 62,643 60,082
Income before income taxes [1]   172,312 93,447 87,681
Current income taxes:        
Federal (2)   15,995 1,419 7,933
Foreign   23,340 18,787 18,763
State and local   968 1,139 705
Current provision for income taxes   40,303 21,345 27,401
Deferred provision (benefit) for income taxes:        
Federal (3)   (11,509) 11,826 931
Foreign   (1,079) (528) (1,414)
State and local   705 677 53
Total deferred provision (benefit) for income taxes   (11,883) 11,975 (430)
Provision for income taxes   28,420 $ 33,320 $ 26,971
Tax on previously deferred earnings of foreign subsidiaries $ 1,900 1,900    
Tax Cuts And Jobs Act of 2017, deferred tax liability, provisional income tax (expense) benefit $ 29,200 $ 29,200    
[1] Includes the allocation of certain administrative expenses and the payment of royalties between domestic and foreign subsidiaries.