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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed income tax expense at statutory federal income tax rate of 35% $ 22,655 $ 13,277 $ 14,450
State income taxes, net of federal provision 292 1,713 227
Foreign tax rate differentials (882) (1,181) (1,262)
U.S. tax on foreign earnings (net of foreign tax credits) (373) (948) (2,168)
Change in valuation allowance 1,230 (944) (11,650)
Proceeds from life insurance     (133)
Return to provision and other adjustments (2,406) (1,557) (1,401)
Other, net 734 133 2,046
Income tax expense $ 21,250 $ 10,493 $ 109
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed income tax expense at statutory federal income tax rate of 35%, tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal provision, tax rate 0.50% 4.50% 0.50%
Foreign tax differentials rate (1.40%) (3.10%) (3.10%)
U.S. tax on foreign earnings rate (0.60%) (2.50%) (5.30%)
Change in valuation allowance, tax rate 1.90% (2.50%) (28.20%)
Proceeds from life insurance rate     (0.30%)
Return to provision and other adjustments rate (3.70%) (4.10%) (3.40%)
Other, net, tax rate 1.10% 0.40% 5.00%
Income tax expense 32.80% 27.70% 0.20%