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Commitments and Contingencies
 3 Months Ended
Mar. 31, 2012
Commitments and Contingencies [Abstract]  
Commitments and Contingencies
11. Commitments and Contingencies
 
Certain operating leases for vehicles contain residual value guarantee provisions, which would become due at the expiration of the operating lease agreement if the fair value of the leased vehicles is less than the guaranteed residual value. As of March 31, 2012, of those leases that contain residual value guarantees, the aggregate residual value at lease expiration was $7,644, of which we have guaranteed $5,964. As of March 31, 2012, we have recorded a liability for the estimated end of term loss related to this residual value guarantee of $1,030 for certain vehicles within our fleet. Our fleet also contains vehicles we estimate will settle at a gain. Gains on these vehicles will be recognized at the end of the lease term.