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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total amount of Interest Expense presented in the consolidated statements of operations $ 8,600 $ 9,063
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 8,600 9,063
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 (2,806) (36)
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 $ 807 $ (18,389)