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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations $ 8,953 $ 9,036 $ 26,996 $ 27,775
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     26,996 27,775
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     (4,925) 4,003
Interest rate swap | Amounts of 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     $ (20,400) $ (17,852)