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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of operations $ 6,209 $ 6,110 $ 18,099 $ 17,140
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     18,099 17,140
Interest Rate Swap | Amounts of previously recorded 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     3,118 (1,669)
Interest Rate Swap | Amounts of gain 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     $ 177 $ 7,835