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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Purchase price in excess of predecessor basis, tax benefit $ 10,306 $ 10,306
Treasury stock, shares 4,396,045 4,586,433
Class A Common Stock [Member]
    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 97,337,700 97,337,700
Common stock, shares issued 41,224,792 41,224,792
Common stock, shares outstanding 36,828,747 36,638,359
Class B Common Stock [Member]
    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 662,300 662,300
Common stock, shares issued 662,296 662,296
Common stock, shares outstanding 662,296 662,296