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Financial Instruments - Derivatives and Hedging (Fair Value) (Details) - Interest Rate Swap - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 0 $ 3,795
Gross derivative liabilities (31,439) (13,449)
Net derivative liabilities $ (31,439) $ (9,654)