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Derivative Instruments And Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
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Sep. 30, 2018 | Jun. 30, 2015
Derivative [Line Items] |  |
Losses in Accumulated OCI to be re-classified within twelve months | $ 4.2 |
Interest Rate Swaps | Nordea Q5000 Loan Maturing April 2020 |  |
Derivative [Line Items] |  |
Notional amount |  | $ 187.5

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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 The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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