Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Aggregate residual value at lease expiration for vehicle leases	$ 11,664
Guaranteed aggregate residual value at lease expiration for vehicle leases	9,448
Liability for the estimated end-of-term loss related to residual value guarantee	$ 227
operating lease commitment term	10 years
Future Minimum Payments Due on Building Lease	$ 2,776