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Financial Instruments - Fair Value Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 14,826 $ 3,698
Accretion for time value of money 506 93
Foreign currency translation adjustment (148)  
Ending balance $ 15,184 $ 3,791