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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
	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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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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