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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Receivables, allowance for doubtful accounts | $ 5,858 | $ 5,860
Preferred stock, Authorized shares | 5,000,000 | 5,000,000
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, Issued |  |
Common stock, Authorized shares | 150,000,000 | 150,000,000
Common stock, par value | $ 0.01 | $ 0.01
Common stock, Issued shares | 87,349,352 | 85,968,630
Treasury stock, shares | 4,648,968 | 2,734,747

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