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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts $ 8,657 $ 11,706
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 10,000 10,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000 100,000
Common stock, shares issued 47,136 45,955
Common stock, shares outstanding 44,716 44,298
Treasury stock, shares 2,420 1,657