Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income before income taxes
Domestic	$ 30,437	$ 40,680	$ 11,584
Foreign	4,142	1,984	6,775
Income before income tax expense	34,579	42,664	18,359
Current:
Federal	(3,709)	(10,544)	(2,328)
State	(2,661)	(2,409)	(718)
Foreign	(3,076)	(1,076)	(829)
Deferred:
Federal	(3,447)	(1,809)	29
State	(1,324)	(227)	562
Foreign	2,989	484	51
Income tax expense	$ (11,228)	$ (15,581)	$ (3,233)
Reconciliation of the statutory tax rates and the effective tax rates
Statutory rate (as a percent)	35.00%	35.00%	34.00%
State taxes, net of federal benefit (as a percent)	7.00%	4.00%
Effect of Rates Different than Statutory (as a percent)	0.00%	(1.00%)	(6.00%)
Non-deductible stock based compensation (as a percent)	3.00%	1.00%	(1.00%)
Other permanent adjustments (as a percent)	1.00%	1.00%	1.00%
Fair market value adjustment on Earn-out (as a percent)	(6.00%)	(5.00%)	5.00%
Research and development credit (as a percent)	(5.00%)	(1.00%)	(8.00%)
Federal net operating losses (as a percent)			(9.00%)
Change in valuation allowance (as a percent)	(2.00%)
Other (as a percent)	(1.00%)	3.00%	2.00%
Net (as a percent)	32.00%	37.00%	18.00%