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Commitments and Contingencies
 6 Months Ended
Jun. 30, 2011
Commitments and Contingencies [Abstract]  
Commitments and Contingencies Disclosure [Text Block]
12. 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 June 30, 2011, of those leases that contain residual value guarantees, the aggregate residual value at lease expiration was $7,418, of which we have guaranteed $5,743. As of June 30, 2011, we have recorded a liability for the estimated end of term loss related to this residual value guarantee of $964 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.
 
During the second quarter of 2011, we entered into a three year software licensing agreement with a total commitment of $2,891.