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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Current Assets:    
Accounts receivable, allowances $ 2,640 $ 2,395
Stockholders' Equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 150,000,000 150,000,000
Common stock, issued (in shares) 14,624,159 14,624,159
Treasury stock (in shares) 3,616,838 3,686,532