Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal tax provision at statutory rate	$ 16,181	$ 16,998	$ 12,260
State taxes	1,365	1,533	883
Non-deductible expenses	551	809	297
Acquisition costs	239	229	0
Share-based compensation expense	748	461	407
Research tax credits	(1,324)	(818)	(1,430)
Domestic production deduction	(1,133)	(1,127)	(816)
Gain on investment	(1,205)	0	0
Other	62	(99)	(551)
Total provision for income taxes	$ 15,484	$ 17,986	$ 11,050