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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current                      
Federal                 $ 39,649 $ 29,684 $ 25,178
State                 7,053 5,001 4,391
Foreign                 3,333 3,568 4,041
Deferred                      
Federal                 260 2,390 2,264
State                 13 753 142
Foreign                 (1,142) (605) (225)
Income tax expense (benefit) $ 8,565 $ 15,898 $ 14,640 $ 10,063 $ 7,675 $ 13,479 $ 13,446 $ 6,191 49,166 40,791 35,791
Income and loss from continuing operations before income taxes                      
Domestic                 131,827 106,381 90,142
Foreign                 7,073 2,298 9,180
Income before taxes $ 25,959 $ 45,695 $ 40,841 $ 26,406 $ 22,408 $ 35,074 $ 34,955 $ 16,242 $ 138,900 $ 108,679 $ 99,322
Reconciliations between the statutory federal income tax rates and effective income tax rates                      
Federal tax rate (as a percent)                 35.00% 35.00% 35.00%
State taxes, net of federal benefit (as a percent)                 3.40% 3.30% 3.00%
Tax benefit of domestic manufacturing deduction (as a percent)                 (2.50%) (2.30%) (2.40%)
Change in valuation allowance (as a percent)                 (0.10%) 1.30% 1.50%
Difference between United States statutory and foreign local tax rates (as a percent)                 (0.30%) 0.20% (0.40%)
Change in uncertain tax position (as a percent)                 (0.20%) 0.30% (0.80%)
Worthless stock deduction on Irish subsidiary                 (0.10%) 0.30% (0.10%)
Effective income tax rate (as a percent)                 35.40% 37.50% 36.00%