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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Accounts and notes receivable, allowances | $ 5,607 | $ 5,026
Common stock, par value | $ 0 | $ 0
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares outstanding | 64,408,983 | 64,187,934

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