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Derivatives (Details) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Oct. 31, 2015 USD ($) instrument | May. 31, 2014 USD ($) instrument | Apr. 30, 2013 USD ($) instrument | Jun. 30, 2011 USD ($) instrument | Sep. 30, 2007 USD ($) instrument
Derivative [Line Items] |  |  |  |  |  |  |  |
Fair value of interest rate hedges recognized in other comprehensive income |  | $ 24,351,000 |  |  |  |  |  |
Interest expense |  | 695,000 | $ 414,000 |  |  |  |  |
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months |  | $ 2,894,000 |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  |  |  |  |  | 2
Aggregate Notional Amount |  |  |  |  |  |  |  | $ 100,000,000
Fair Value When Terminated |  |  |  |  |  |  |  | 3,260,000
Fair Value Deferred In Other Comprehensive Income | [1] |  |  |  |  |  |  | $ 3,228,000
Treasury Lock |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  |  |  |  | 2 |
Aggregate Notional Amount |  |  |  |  |  |  | $ 150,000,000 |
Fair Value When Terminated |  |  |  |  |  |  | 5,300,000 |
Fair Value Deferred In Other Comprehensive Income | [1] |  |  |  |  |  | $ 5,218,000 |
Forward Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  | 4 | 3 | 4 |  |
Aggregate Notional Amount |  |  |  | $ 300,000,000 | $ 225,000,000 | $ 240,000,000 |  |
Fair Value When Terminated |  |  |  | 13,369,000 | 6,312,000 | 3,156,000 |  |
Fair Value Deferred In Other Comprehensive Income | [1] |  |  | $ 13,369,000 | $ 6,312,000 | $ 3,141,000 |  |
[1] | The amount reported in accumulated other comprehensive income will be reclassified to interest expense as interest payments are made on the related notes payable.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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