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Financial Instruments - Derivatives and Hedging (Fair Value) (Details) - Interest Rate Swap - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 0 $ 0
Gross derivative liabilities (19,516) (28,225)
Net derivative liabilities $ (19,516) $ (28,225)