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Derivatives (Terminated Derivatives) (Details) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) instrument | Sep. 30, 2017 USD ($) instrument | Dec. 31, 2016 USD ($) instrument | Oct. 31, 2015 USD ($) instrument | May 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument
--- | --- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |  |
Fair Value Deferred In Other Comprehensive Income | $ (11,738,000) |  |  |  |  |  |
Forward Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  | 2 | 2 | 2 | 4 | 3 | 4
Aggregate Notional Amount | $ 200,000,000 | $ 250,000,000 | $ 250,000,000 | $ 180,000,000 | $ 300,000,000 | $ 225,000,000 | $ 240,000,000
Liability Fair Value When Terminated |  |  | 7,690,000 |  | 13,369,000 | 6,312,000 | 3,156,000
Asset Fair Value When Terminated |  | (4,080,000) |  | (13,352,000) |  |  |
Fair Value Deferred In Other Comprehensive Income |  | $ (4,080,000) | $ 7,688,000 | $ (13,345,000) | $ 13,369,000 | $ 6,312,000 | $ 3,141,000

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