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Derivatives (Terminated Derivatives) (Details) | Jun. 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 | $ 3,920,000 |  |  |  |  |  |
Forward Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  | 2 | 2 | 2 | 4 | 3 | 4
Aggregate Notional Amount | $ 90,000,000 | $ 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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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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