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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheets [Abstract]    
Accounts receivable, reserves $ 4,909 $ 4,523
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 103,740,000 103,341,000
Deferred stock units, outstanding   231,000
Treasury stock, shares 15,807,000 15,367,000