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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Accounts receivable, less allowance for doubtful accounts of $12,781 in 2019; $8,325 in 2018 | $ 12,781 | $ 8,325
Common shares, par value (dollars per share) | $ 0 | $ 0.00
Common shares, shares authorized (shares) | 63,000 | 63,000
Common shares, shares issued (shares) | 33,550 | 29,430
Preferred shares, par value (dollars per share) | $ 0 | $ 0
Preferred shares, shares authorized (shares) | 1,000 | 1,000
Preferred shares, shares issued (shares) | 0 | 0
Treasury shares, at cost (shares) | 207 | 936

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