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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total amount of Interest Expense presented in the consolidated statements of operations | $ 36,026 | $ 36,757 | $ 38,374
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 | 36,026 | 36,757 | 38,374
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 | (7,751) | 4,328 | 2,722
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 | $ (20,380) | $ (15,119) | $ 5,321

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