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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Receivables, less allowances of $5,052 and $4,430, respectively $ 5,052 $ 4,430
Shareholders' equity:    
Common shares, authorized (in shares) 65,000,000 65,000,000
Common shares, par value (in dollars per share) $ 0.10 $ 0.10
Common shares, outstanding (in shares) 46,522,000 46,630,000