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Derivative and Hedging Activities (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 06, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, Cash Paid on Hedge | $ (20,400) |  |  | $ (20,430) | $ 0 |  |
Unrealized Gain (Loss) on Derivatives |  | $ 0 | $ 5,200 | (13,000) | $ 14,000 |  |
Derivative, Notional Amount | $ 300,000 |  |  |  |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net |  | 1,300 |  | 1,300 |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 0 |  | 0 |  |  | $ 7,400
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (300) |  | 500 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 0 |  | 0 |  |  | 0
Interest Rate Derivative Liabilities, at Fair Value |  | $ 0 |  | $ 0 |  |  | $ 7,400
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held |  |  | 5 |  | 5 |  |
Derivative, Notional Amount |  |  | $ 400,000 |  | $ 400,000 | $ 300,000 |

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