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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Allowance for doubtful trade accounts receivable $ 10,154 $ 9,484
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 80,533,536 80,533,536
Common stock, shares outstanding 72,847,576 72,644,998
Treasury stock, shares 7,685,960 7,888,538