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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Cash and cash equivalents | $ 151,063 | $ 170,385
Significant Unobservable Inputs (Level 3) |  |
Liabilities |  |
Fair value of the contingent consideration |  | $ 716
Interest rate swap | Significant Other Observable Inputs (Level2) |  |
Liabilities |  |
Derivative liability | $ 2,829 |

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