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Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Tax at the U.S. federal statutory rate $ 60,309 $ 32,706 $ 30,688
State income taxes, net of federal tax benefit of $586, $636 and $265, respectively 1,087 1,181 493
Rate benefit from foreign earnings (1) (5,442) (3,642) (3,531)
Net tax benefit resulting from the enactment of the Tax Act (27,269) 0 0
Nondeductible transaction related costs 0 2,659 0
Other taxes and adjustments, net (265) 416 (679)
Provision for income taxes $ 28,420 $ 33,320 $ 26,971
Effective tax rate 16.50% 35.70% 30.80%
Federal Income tax benefit for state income taxes $ 586 $ 636 $ 265
Foreign inflation index adjustment $ 4,000 $ 1,500 $ 1,400