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Business Combination - Consideration Transfered (Details) - USD ($) $ in Thousands | Aug. 23, 2018 | Mar. 31, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |
Estimated fair value of deferred consideration payable |  | $ 18,900 | $ 18,300
Contingent consideration payable |  | $ 330,900 | $ 310,240
Agilis |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration | $ 49,200 |  |

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