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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Statement of Financial Position [Abstract] |  |  |
Accounts receivable, allowances | $ 2,991 | $ 1,536 | $ 2,226
Common stock, par value | $ 0.01 | $ 0.01 | $ 0.01

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