Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal									$ 29,684	$ 25,178	$ 19,804
State									5,001	4,391	3,243
Foreign									3,568	4,041	3,926
Deferred
Federal									2,390	2,264	3,646
State									753	142	404
Foreign									(605)	(225)	(430)
Income tax expense (benefit)	$ 7,675	$ 13,479	$ 13,446	$ 6,191	$ 4,942	$ 11,577	$ 11,667	$ 7,605	40,791	35,791	30,593
Income and loss from continuing operations before income taxes
Domestic									106,381	90,142	74,912
Foreign									2,298	9,180	6,652
Income before taxes	$ 22,408	$ 35,074	$ 34,955	$ 16,242	$ 15,322	$ 32,191	$ 32,118	$ 19,691	$ 108,679	$ 99,322	$ 81,564
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)									3.30%	3.00%	3.00%
Tax benefit of domestic manufacturing deduction (as a percent)									(2.30%)	(2.40%)	(2.20%)
Change in valuation allowance (as a percent)									1.30%	1.50%	1.30%
Difference between United States statutory and foreign local tax rates (as a percent)									0.20%	(0.40%)	0.10%
Change in uncertain tax position (as a percent)									0.30%	(0.80%)	(0.40%)
Worthless stock deduction on Irish subsidiary									0.30%	(0.10%)	(0.70%)
Effective income tax rate (as a percent)									37.50%	36.00%	37.50%