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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Accounts and other receivables, allowance for doubtful accounts and sales returns | $ 3,109 | $ 3,304
Common stock, no par value |  |
Common stock, shares issued | 33,120,303 | 33,017,422
Common stock, shares outstanding | 33,120,303 | 33,017,422
Common Stock, Shares Held in Employee Trust, Shares | 71,710 | 71,309

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