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Debt - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) instrument | Dec. 31, 2015 USD ($)
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized premium | $ 2,800,000 | $ 14,300,000
Unamortized debt issuance expense | 17,200,000 | 15,600,000
Unsecured Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance expense | $ 3,600,000 | 3,300,000
Number of lines of unsecured credit | instrument | 2 |
Aggregate borrowing capacity | $ 1,000,000,000 |
Mortgage Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized premium | 55,300,000 | 64,800,000
Unamortized debt issuance expense | $ 7,400,000 | $ 8,000,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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