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Mortgages and Notes Payable - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |  |
Mortgages and notes payable | $ 882,952,000 | $ 945,216,000 |  |
Weighted-average interest rate | 4.90% | 5.20% |  |
Gains (charges) on debt satisfaction from continuing operations | $ 4,122,000 | $ (7,016,000) | $ (11,811,000) |
Interest paid, capitalized | $ 6,062,000 | $ 3,441,000 | $ 2,397,000 |
Unsecured Credit Agreement [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 905,000,000
Line of credit facility, maximum borrowing capacity with lender approval |  |  |  | $ 1,810,000,000
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective interest rate | 2.20% | 2.20% |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective interest rate | 7.80% | 8.50% |  |

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