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Financial Instruments - Fair Value Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Beginning balance $ 11,194 $ 15,184 $ 14,826 $ 2,884 $ 3,791 $ 3,698
Accretion expense 3,532 614 506 531 93 93
Foreign currency translation adjustment 359 88 (148) (333)    
Payments   (4,692)     (1,000)  
Additions 3,460     14,004    
Ending balance $ 18,545 $ 11,194 $ 15,184 $ 17,086 $ 2,884 $ 3,791