Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details 2) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	[1],[2]	Sep. 30, 2014	[1],[2]	Jun. 30, 2014	[1],[2]	Mar. 31, 2014	[1],[2]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Difference between income tax provision computed at the statutory Federal income tax rate and financial statement income tax related to continuing operations
Provision at Federal rate of 35%																	$ 33,719	$ 21,533	$ 21,532
State income taxes, net of Federal impact																	2,652	2,132	2,109
Research and experimentation credits																	(2,135)	(450)	(5,754)
Tax uncertainties																	(166)	187	(269)
Section 199 manufacturing deduction																	(2,884)	(1,936)	(2,263)
Foreign rate differential																	688	2,847	1,133
Valuation allowance for deferred tax assets																	919	3,602	(3,312)
Other impact of foreign operations																	283	(3,555)	2,088
Other																	698	1,451	987
Total income tax provision	$ 5,573		$ 11,196		$ 9,652		$ 7,353		$ 5,331		$ 4,831		$ 8,338		$ 7,311		$ 33,774	$ 25,811	$ 16,251

[1] Fluctuations in our effective income tax rate between quarters generally relates to the accounting for discrete income tax items in any given quarter, and revisions of estimates for certain income tax components during the year. •For 2015: Our effective income tax rates for the first, second, third, and fourth quarters were 44%, 43%, 40%, and 19%, respectively. The low fourth quarter rate can be mainly attributed to full year impact of the 2015 R&D tax credits, as the legislation was not passed until December 2015. •For 2014: Our effective income tax rates for the first, second, third, and fourth quarters were 43%, 47%, 48%, and 32%, respectively. The low fourth quarter rate can be mainly attributed to full year impact of the 2014 R&D tax credits, as the legislation was not passed until December 2014.

[2] As explained in Note 7, our 2014 results have been adjusted as a result of the immaterial correction made to the fourth quarter 2014 income tax provision.