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Dealer Finance Receivables Summary of Dealer Finance Receivables (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dealer Finance Receivables [Roll Forward]      
Balance Beginning of Period   $ 24 $ 0
Advances during the period 24 45,438  
Revenue Recognized, Net   2,168 0
Payments to reduce amount advanced   (6,674) 0
Balance end of period $ 24 $ 40,956 $ 24