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Fair Value Measurements - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) Properties | Dec. 31, 2016 USD ($) Properties | Dec. 31, 2015 USD ($) Properties
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment | $ 27,754,000 | $ 11,208,000 | $ 108,154,000
Provision for asset impairment | 27,754,000 | 117,722,000 | 108,154,000
Provision for asset impairment, discontinued operations | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment | 27,754,000 | 11,208,000 | 108,154,000
Investment properties, discontinued operations, total impairment loss | 0 | 106,514,000 | 0
Fair Value, Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Notional amount | 150,000,000 | 150,000,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Recurring fair value measurements | 0 | 0 |
Retail [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment | $ 27,754,000 | $ 11,208,000 | 15,987,000
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment |  |  | $ 92,167,000
Discontinued Operations [Member] | Maximum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discount rates |  | 15.25% |
Fair value inputs, capitalization rate |  | 10.00% |
Discontinued Operations [Member] | Minimum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discount rates |  | 7.75% |
Fair value inputs, capitalization rate |  | 6.75% |
Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Discounted cash flow method, term |  |  | 10 years
Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, capitalization rates | 8.00% | 7.00% | 8.75%
Investment properties, discount rates | 9.00% | 8.00% | 10.75%
Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, capitalization rates | 7.00% | 6.00% | 7.50%
Investment properties, discount rates | 8.00% | 7.00% | 8.00%
Real Estate [Member] | Retail [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment, properties affected | Properties | 6 | 3 | 2
Mortgages [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discount rates | 4.20% | 5.07% |
Line of Credit and Term Loan [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discount rates | 3.48% | 3.15% |
Downtown Railyard Venture, LLC [Member] | Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discount rates |  |  | 14.00%
Real Estate [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment |  | $ 29,931,000 |
Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, capitalization rates |  | 7.00% |
Investment properties, discount rates |  | 8.00% |
Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, capitalization rates |  | 6.75% |
Investment properties, discount rates |  | 7.00% |
Spin-Off of Highlands REIT Inc. [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment properties, discontinued operations, total impairment loss |  | $ 76,583,000 |

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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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