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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
Unrealized gain (loss) arising during the period, tax benefit $ (370) $ 701 $ (335) $ 1,524
Reclassification adjustment for loss included in floor plan interest expense, tax provision $ 364 $ 692 $ 1,087 $ 1,361