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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Unrealized gain (loss) arising during the period, tax benefit $ (2,138) $ (6,310) $ 291
Reclassification adjustment for loss included in floor plan interest expense, tax provision $ 2,771 $ 46 $ 3,265