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Derivatives (Details) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) instrument | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) instrument | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) instrument | Dec. 31, 2016 USD ($) instrument | Oct. 31, 2015 USD ($) instrument | May 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument | Jun. 30, 2011 USD ($) instrument
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of interest rate hedges recognized in other comprehensive income | $ 13,599,000 |  | $ 13,599,000 |  |  |  |  |  |  |
Interest expense | 27,110,000 | $ 27,274,000 | 53,712,000 | $ 53,888,000 |  |  |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | (2,192,000) |  | (2,192,000) |  |  |  |  |  |  |
Gain (loss) on cash flow hedge ineffectiveness, net |  |  | 0 |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | 1,056,000 | $ 903,000 |  |  |  |  |  |
Treasury Lock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  |  |  |  |  |  | 2
Aggregate Notional Amount |  |  |  |  |  |  |  |  |  | $ 150,000,000
Liability (Asset) Fair Value When Terminated |  |  |  |  |  |  |  |  |  | 5,300,000
Fair Value Deferred In Other Comprehensive Income |  |  |  |  |  |  |  |  |  | $ 5,218,000
Forward Swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | instrument |  |  |  |  | 2 | 2 | 4 | 3 | 4 |
Aggregate Notional Amount | 250,000,000 |  | 250,000,000 |  | $ 250,000,000 | $ 180,000,000 | $ 300,000,000 | $ 225,000,000 | $ 240,000,000 |
Liability (Asset) Fair Value When Terminated |  |  |  |  | 7,690,000 |  | 13,369,000 | 6,312,000 | 3,156,000 |
Liability (Asset) Fair Value When Terminated | $ (1,095,000) |  | $ (1,095,000) |  |  | (13,352,000) |  |  |  |
Fair Value Deferred In Other Comprehensive Income |  |  |  |  | $ 7,688,000 | $ (13,345,000) | $ 13,369,000 | $ 6,312,000 | $ 3,141,000 |
Number of interest rate derivatives entered into | instrument | 2 |  | 2 |  |  |  |  |  |  |

X
- 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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