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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Allowance for doubtful accounts $ 4,577 $ 4,608
Accumulated amortization of other intangible assets $ 12,783 $ 19,473
STOCKHOLDERS’ EQUITY:    
Common stock, par value (dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (shares) 100,000,000 100,000,000
Common stock, shares issued (shares) 74,037,000 73,793,000
Common stock, shares outstanding (shares) 74,037,000 73,793,000
Common stock in treasury (shares) 1,699,000 1,759,000