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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Allowance for doubtful accounts | $ 2,548 | $ 2,716
Amounts pledged | $ 653,651 | $ 102,501
Class A non-voting common stock |  |
Common stock, shares issued | 13,572,265 | 13,268,522
Common stock, shares outstanding | 13,572,265 | 13,268,522
Class B voting common stock |  |
Common stock, shares issued | 99,680 | 99,680
Common stock, shares outstanding | 99,680 | 99,680

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