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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current                      
Federal                 $ 36,077 $ 39,649 $ 29,684
State                 6,357 7,053 5,001
Foreign                 3,068 3,333 3,568
Deferred                      
Federal                 6,093 260 2,390
State                 544 13 753
Foreign                 (338) (1,142) (605)
Income tax expense (benefit) $ 10,829 $ 16,581 $ 16,712 $ 7,679 $ 8,565 $ 15,898 $ 14,640 $ 10,063 51,801 49,166 40,791
Income and loss from continuing operations before income taxes                      
Domestic                 132,105 131,827 106,381
Foreign                 12,313 7,073 2,298
Income before taxes                 $ 144,418 $ 138,900 $ 108,679
Reconciliations between the statutory federal income tax rates and effective income tax rates                      
Federal tax rate                 35.00% 35.00% 35.00%
State taxes, net of federal benefit                 3.20% 3.40% 3.30%
Tax benefit of domestic manufacturing deduction                 (2.00%) (2.50%) (2.30%)
Mandatory deemed repatriation of foreign earnings                 2.70% 0.00% 0.00%
Change in U.S. tax rate applied to deferred taxes                 (1.90%) 0.00% 0.00%
Change in U.S. tax rate applied to deferred taxes                 1.30% (0.10%) 1.30%
Difference between United States statutory and foreign local tax rates                 (0.80%) (0.30%) 0.20%
Change in uncertain tax position                 0.00% (0.20%) 0.30%
Other                 1.60% (0.10%) 0.30%
Effective income tax rate                 35.90% 35.40% 37.50%