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Derivative Instruments and Hedging Activities - Cash Flow Hedging on AOCI (Details) - Interest Rate Swaps - USD ($) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amount of Gain/(Loss) Recognized in OCI on Derivative | $ 1,200,000 | $ 0
Cash Flow Hedging | Interest expense |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income | $ 0 | $ 0

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