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Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Restricted cash and short-term deposits, carrying value $ 136,535 $ 188,289
Interest Rate Swap    
Derivative [Line Items]    
Restricted cash and short-term deposits, carrying value $ 11,002 $ 0