Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details 1) - 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
Current:
Federal																	$ 41,002	$ 20,374	$ 12,880
State																	5,227	2,443	916
Foreign																	3,651	2,953	4,273
Total																	49,880	25,770	18,069
Deferred:
Federal																	(14,611)	1,139	1,130
State																	(1,147)	837	2,329
Foreign																	(348)	(1,935)	(5,277)
Total																	(16,106)	41	(1,818)
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.