Commitments and Contingencies - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) claim	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Long-term Purchase Commitment [Line Items]
Rent expense	$ 3,600,000	$ 2,700,000	$ 6,800,000	$ 5,300,000
Future minimum sublease rentals	1,000,000		1,000,000
Letters of credit available	1,900,000		1,900,000		$ 1,900,000
Amount drawn against letters of credit	0		0
Non-cancellable open orders	21,800,000		$ 21,800,000		$ 23,200,000
Number of claims | claim			0
Software and Services [Member]
Long-term Purchase Commitment [Line Items]
Non-cancellable open orders	$ 26,000,000		$ 26,000,000