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Financial Instruments - Fair Value Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance $ 14,826 $ 3,698 $ 3,750
Accretion expense 5,593 2,372 479
Payments (4,692) (1,000) (531)
Additions 3,460 9,746  
Foreign currency translation adjustment 931 10  
Ending balance $ 20,118 $ 14,826 $ 3,698