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Derivatives (Details) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | 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 |  | $ 12,323,000 |  |  |  |  |  |  |
Interest expense |  | 1,256,000 | $ 736,000 |  |  |  |  |  |
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months |  | 1,751,000 |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  |  |  |  |  |  | 2
Aggregate Notional Amount |  |  |  |  |  |  |  |  | $ 100,000,000
Fair Value When Terminated | [1] |  |  |  |  |  |  |  | 3,260,000
Fair Value Deferred In Other Comprehensive Income | [2] |  |  |  |  |  |  |  | $ 3,228,000
Treasury Lock |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  |  |  |  |  | 2 |
Aggregate Notional Amount |  |  |  |  |  |  |  | $ 150,000,000 |
Fair Value When Terminated | [1] |  |  |  |  |  |  | 5,300,000 |
Fair Value Deferred In Other Comprehensive Income | [2] |  |  |  |  |  |  | $ 5,218,000 |
Forward Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of derivatives | instrument |  |  |  | 3 |  | 4 |  |  |
Aggregate Notional Amount |  | 300,000,000 |  | $ 225,000,000 |  | $ 240,000,000 |  |  |
Fair Value When Terminated |  | $ 10,297,000 |  | 6,312,000 | [1] | 3,156,000 | [1] |  |
Fair Value Deferred In Other Comprehensive Income | [2] |  |  | $ 6,312,000 |  | $ 3,141,000 |  |  |
[1] | Liability
[2] | 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 Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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