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Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Allowance for doubtful accounts	$ 4,758,000	$ 4,069,000
Accumulated amortization of other intangible assets	$ 7,366,000	$ 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	69,441,000	69,315,000
Common stock in treasury, shares	2,688,000	3,139,000

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