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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Accounts and other receivables, allowance for doubtful accounts and sales returns | $ 3,124 | $ 3,102
Common stock, no par value |  |
Common stock, shares issued | 33,026,931 | 32,933,807
Common stock, shares outstanding | 33,026,931 | 32,933,807
Common Stock, Shares Held in Employee Trust, Shares | 70,884 | 69,622

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