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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total amount of Interest Expense presented in the consolidated statements of operations $ 32,273 $ 36,026 $ 36,757
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 32,273 36,026 36,757
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 (8,286) (7,751) 4,328
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 $ 3,786 $ (20,380) $ (15,119)