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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS    
Trade receivables, allowance for doubtful accounts (in dollars) $ 2,406 $ 4,350
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized shares 200,000 200,000
Common stock, issued shares 94,141 92,797
Treasury stock, shares 44,311 41,426