Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Consolidated Balance Sheets      
Accounts receivable, allowance $ 14,171 $ 13,026 $ 11,499
Preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Preferred stock, authorized shares 25,000,000 25,000,000 25,000,000
Preferred stock, issued shares 0 0 0
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, authorized shares 300,000,000 300,000,000 300,000,000
Common stock, issued shares 58,762,204 57,966,771 57,473,915