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Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Restricted cash and short-term deposits, carrying value $ 162,199 $ 188,289
Interest Rate Swap    
Derivative [Line Items]    
Restricted cash and short-term deposits, carrying value $ 11,142 $ 0