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Condensed Consolidated Balance Sheets (Parenthetical) (unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts $ 2,726 $ 2,548
Amounts pledged $ 650,677 $ 653,651
Class A non-voting common stock
    
Common stock, shares issued 13,489,162 13,572,265
Common stock, shares outstanding 13,489,162 13,572,265
Class B voting common stock
    
Common stock, shares issued 99,680 99,680
Common stock, shares outstanding 99,680 99,680