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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 71,076 $ 66,007 $ 150,847 $ 140,074  
Provision for income taxes (Note J) $ 14,757 $ 21,181 $ 32,885 $ 45,703  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 20.76228% 32.08902% 21.80023% 32.62775%  
Foreign Income Tax Expense (Benefit), Continuing Operations         $ 21,994