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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
Unrealized gain (loss) arising during the period, tax benefit $ 590 $ 3,519 $ 2,114 $ 5,995
Reclassification adjustment for loss included in floor plan interest expense, tax provision $ 705 $ 0 $ 2,066 $ 46