Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Category sqft	Dec. 31, 2014	Mar. 31, 2014
Loss Contingencies [Line Items]
Number of major categories the entity commitments and contingencies are grouped into	3
Net deferred tax liability	$ 1,897	$ 1,341	$ 1,300
Square footage of office facility	18,500
Original lease expiration date	May 31, 2017
Extended lease expiration date	Aug. 31, 2019
Increase in area of real estate property	13,642
Expected future lease payments [Abstract]
2014	545
2015	714
2016	726
2017	740
Thereafter	502
Total	$ 3,227