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Derivatives (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) instrument | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) instrument | Sep. 30, 2018 USD ($) instrument | Sep. 30, 2017 USD ($) instrument | Oct. 31, 2015 USD ($) instrument | May 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |
Remaining amount in other comprehensive income for effective portion of previous interest rate hedges | $ 6,911,000 |  |  |  |  |  |  |
Interest expense | 115,847,000 | $ 109,109,000 | $ 96,352,000 |  |  |  |  |
Interest rate hedges loss to be reclassified into interest expense over next 12 months | $ 1,306,000 |  |  |  |  |  |  |
Number of derivative financial instruments outstanding | instrument | 0 |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |
Interest expense | $ 3,664,000 | $ 1,932,000 | $ 2,802,000 |  |  |  |  |
Forward Swap |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  | 2 | 2 | 2 | 4 | 3 | 4
Aggregate Notional Amount |  |  | $ 180,000,000 | $ 250,000,000 | $ 250,000,000 | $ 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 |  |  | (13,352,000) | (4,080,000) |  |  |  |
Fair Value Deferred In Other Comprehensive Income |  |  | $ (13,345,000) | $ (4,080,000) | $ 7,688,000 | $ 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 Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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