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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations $ 7,928 $ 8,953 $ 26,582 $ 26,996
Interest Rate Swap        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations     26,582 26,996
Interest Rate Swap | Amounts of previously recorded gain/(loss) reclassified from OCI into Interest Expense        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations     (7,318) (4,925)
Interest Rate Swap | Amounts of gain (loss) recognized in OCI        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations     $ 2,410 $ (20,400)