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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts $ 4,878 $ 5,114
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 183,043,921 181,537,568
Common stock, outstanding 155,561,314 154,193,754
Treasury stock, shares 27,482,607 27,343,814