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Financial Instruments - Fair Value Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]            
Beginning balance $ 14,611 $ 19,795 $ 20,118 $ 11,194 $ 15,184 $ 14,826
Additions   1,093   3,460    
Accretion expense 116 676 1,289 3,532 614 506
Payments   (4,122) (1,000)   (4,692)  
Foreign currency translation adjustment (159) 264 (612) 359 88 (148)
Remeasurement gain   (3,095)        
Ending balance $ 14,568 $ 14,611 $ 19,795 $ 18,545 $ 11,194 $ 15,184