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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable, allowances | $ 2,451 | $ 1,895
Common stock, par value | $ 0.01 | $ 0.01

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