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Derivative Instruments and Hedging Activity - Consolidated statements of operations and other comprehensive loss (Details) - Interest rate swap - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other comprehensive income (loss) - change in fair value and settlement of interest rate swaps | $ (34,558) | $ (8,657) | $ 193
Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative Instruments, Amount of Income/(Loss) Reclassified from Accumulated OCI into Expense | $ 4,562 | $ (118) | $ (139)

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