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Fair Value Measurements - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Properties | Sep. 30, 2016 USD ($) Properties | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment | $ 0 | $ 2,818,000 | $ 16,440,000 | $ 11,208,000 |
Provision for asset impairment |  |  | $ 16,440,000 | 117,722,000 |
Mortgages payable |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value inputs, discount rate (percent) |  |  | 4.19% |  | 5.07%
Line of Credit [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value inputs, discount rate (percent) |  |  | 3.21% |  | 3.15%
Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment | 0 | 2,818,000 | $ 16,440,000 | 11,208,000 |
Investment properties, discontinued operations | 0 | $ 0 | 0 | 106,514,000 |
Continuing Operations | Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment | $ 0 |  |  |  |
Discontinued Operations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment |  |  |  | $ 76,583,000 |
Retail | Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment, properties affected | Properties |  |  |  | 3 |
Real Estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment |  |  | $ 29,931,000 |  |
Real Estate | Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment, properties affected | Properties |  |  | 3 |  |
Minimum | Discontinued Operations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  | 6.75% |
Fair value inputs, discount rate (percent) |  |  |  | 7.75% |
Minimum | Real Estate | Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  | 6.75% |
Fair value inputs, discount rate (percent) |  |  |  | 7.00% |
Maximum | Discontinued Operations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  | 10.00% |
Fair value inputs, discount rate (percent) |  |  |  | 15.25% |
Maximum | Real Estate | Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  | 7.00% |
Fair value inputs, discount rate (percent) |  |  |  | 8.00% |

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