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Contingent Consideration Payable - Payable Balance (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Contingent Consideration Payable Rollforward:    
Related party payable, beginning balance $ 17,327 $ 28,840
Payment of related party payable (2,065) (3,688)
Fair value adjustments 2,788 2,441
Related party payable, ending balance $ 18,050 $ 27,593