Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Aggregate residual value at lease expiration for vehicle leases $ 11,316
Guaranteed aggregate residual value at lease expiration for vehicle leases 9,171
Liability for the estimated end-of-term loss related to residual value guarantee $ 183