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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Treasury stock, shares 1,639,843 1,639,843
Common Class A
    
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares outstanding 27,838,478 27,406,424
Common Class B
    
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares outstanding 10,792,223 10,776,697