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Derivative Instruments and Hedging Activity - Consolidated statements of operations and other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative Instruments, Amount of Income/(Loss) Recognized in OCI on Derivative (Effective Portion) | $ (7,418) | $ 454 | $ (14,617) | $ 3,166
Interest Rate Swap [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative Instruments, Amount of Income/(Loss) Recognized in OCI on Derivative (Effective Portion) | (7,418) | 454 | (14,617) | 3,166
Interest Rate Swap [Member] | Interest Expense [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative Instruments, Amount of Income/(Loss) Reclassified from Accumulated OCI into Expense (Effective Portion) | $ 22 | $ 67 | $ 366 | $ (24)

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