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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Current Assets:    
Allowance for doubtful accounts $ 4,506,000 $ 4,069,000
Accumulated amortization of other intangible assets $ 7,909,000 $ 5,938,000
STOCKHOLDERS' EQUITY:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 69,473,000 69,315,000
Common stock in treasury, shares 2,684,000 3,139,000