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Commitments and Contingencies
 3 Months Ended
Mar. 31, 2013
Commitments and Contingencies Disclosure [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, 2013, of those leases that contain residual value guarantees, the aggregate residual value at lease expiration was $11,673, of which we have guaranteed $7,558. As of March 31, 2013, we have recorded a liability for the estimated end of term loss related to this residual value guarantee of $400 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 first quarter of 2013, we renewed our lease for our Louisville facility. This lease is a five year lease with a total commitment of $4,710.
During the second quarter of 2012, we entered into a three year agreement with a supplier, commencing January 1, 2013, with a total commitment of $2,102 of which $1,883 is still outstanding as of March 31, 2013.