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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance $ 1,424 $ 1,391
Common Stock, par value
Common Stock, shares authorized 55,000,000 55,000,000
Common Stock, shares issued 36,821,656 36,534,464
Common Stock, shares outstanding 36,821,656 36,534,464