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Mortgage and Other Indebtedness, Net (Schedule of Unsecured Lines of Credit) (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Total Outstanding | $ 1,065,450,000 | $ 888,770,000
Wells Fargo Bank |  |
Debt Instrument [Line Items] |  |
Letter of credit, outstanding | $ 150,000 |
Wells Fargo Bank |  |
Debt Instrument [Line Items] |  |
Line of credit, extension fee | 0.15% |
Wells Fargo - Facility A |  |
Debt Instrument [Line Items] |  |
Total Capacity | $ 500,000,000 |
Total Outstanding | 0 |
Unsecured Line of Credit, First Tennessee |  |
Debt Instrument [Line Items] |  |
Total Capacity | 100,000,000 |
Total Outstanding | $ 36,034,000 |
Unsecured Line of Credit, First Tennessee | Wells Fargo Bank |  |
Debt Instrument [Line Items] |  |
Line of credit, extension fee | 0.20% |
Wells Fargo - Facility B |  |
Debt Instrument [Line Items] |  |
Total Capacity | $ 500,000,000 |
Total Outstanding | 43,936,000 |
Unsecured lines of credit |  |
Debt Instrument [Line Items] |  |
Total Capacity | 1,100,000,000 |
Total Outstanding | 79,970,000 |
Wells Fargo Bank | Letter of Credit |  |
Debt Instrument [Line Items] |  |
Total Capacity | 30,000,000 |
First Tennessee Bank |  |
Debt Instrument [Line Items] |  |
Total Capacity | $ 20,000,000 |

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- Definition The percentage fee charged for exercising the extension option on the line of credit. + References No definition available. + Details
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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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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