Commitments and Contingencies - Lease Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Capital Lease Obligations	Dec. 31, 2011 Capital Addition Purchase Commitments Capital Lease Obligations	Mar. 31, 2014 Maintenance and Support	Dec. 31, 2013 Maintenance and Support
Leased Assets [Line Items]
Debt interest rate				1.80%
Debt face amount					$ 3,100,000.0
Recorded unconditional purchase obligation						100,000	300,000
Rent expense	(1,500,000)	(1,300,000)
Deferred rent credit	$ (600,000)		$ (600,000)