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10. Stock-Based Compensation (Details 4) - USD ($) $ in Thousands | Dec. 31, 2018 | Aug. 22, 2018
--- | --- | ---
SARs liability | $ 1,132 | $ 1,277
Level 1 |  |
SARs liability | 0 |
Level 2 |  |
SARs liability | 0 |
Level 3 |  |
SARs liability | $ 1,132 |

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