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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Accounts receivable, reserves (in dollars) $ 1,630 $ 1,066
Preferred shares, no par value $ 0 $ 0
Preferred shares, authorized 5,000,000 5,000,000
Preferred shares, issued 0 0
Common shares, no par value $ 0 $ 0
Common shares, authorized 60,000,000 60,000,000
Common shares, issued 28,966,000 28,907,000
Common shares, outstanding 27,850,000 27,912,000
Common shares held in treasury, shares 1,116,000 995,000