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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts and notes receivable, allowances | $ 3,415 | $ 5,233
Common stock, par value | $ 0 | $ 0
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares outstanding | 66,111,317 | 65,688,356

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