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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Current Assets:    
Allowance for doubtful accounts $ 5,088,000 $ 4,506,000
Accumulated amortization of other intangible assets $ 8,451,000 $ 7,909,000
STOCKHOLDERS' EQUITY:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 69,701,000 69,473,000
Common stock in treasury, shares 2,647,000 2,684,000