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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts receivable, allowance for doubtful accounts $ 4,734 $ 4,887
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 300,000,000 300,000,000
Common stock, issued 184,053,434 183,295,350
Common stock, outstanding 151,773,850 155,807,779
Treasury stock, shares 32,279,584 27,487,571