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Financial Instruments - Currency Rate Risk Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Risks and Uncertainties [Abstract]      
Foreign exchange gain (loss) on translation $ 14,951 $ 37,687 $ (12,337)
Impact of ten percent change in exchange rate $ 170,817 $ 174,902