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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Aggregate residual value at lease expiration for vehicle leases	$ 11,574
Guaranteed aggregate residual value at lease expiration for vehicle leases	8,867
Liability for the estimated end-of-term loss related to residual value guarantee	453
Louisville facility lease term	5 years
Louisville facility, future minimum lease payments due	4,710
Term of Unrecorded Unconditional Purchase Obligation	three year
Minimum purchase obligation	2,102
Remaining minimum purchase obligation	$ 1,665

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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