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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2015 | May 01, 2019 shares | Apr. 30, 2019 shares | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VIE real estate owned carrying value | $ 1,515,206,000 |  |  |  | $ 1,508,682,000 |  |  |  | $ 1,515,206,000 | $ 1,508,682,000 | $ 1,534,599,000 |  |  |  |
Mortgage loan payable | 46,370,000 |  |  |  | 47,315,000 |  |  |  | 46,370,000 | 47,315,000 |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | 41,800,000 | 36,100,000 | 36,500,000 |  |  |  |
Cash at consolidated joint ventures | 300,000 |  |  |  | 200,000 |  |  |  | 300,000 | 200,000 |  |  |  |  |
Allowance for doubtful accounts receivable | 5,600,000 |  |  |  | 5,900,000 |  |  |  | 5,600,000 | 5,900,000 |  |  |  |  |
Provision for doubtful accounts included in operating, maintenance and management expenses |  |  |  |  |  |  |  |  | $ 400,000 | 2,200,000 | 1,700,000 |  |  |  |
Number of reportable segment | Segment |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Operating lease, right-of-use asset | 13,638,000 |  |  |  |  |  |  |  | $ 13,638,000 |  |  |  |  |  | $ 14,600,000
Operating lease, right-of-use liability | 13,778,000 |  |  |  |  |  |  |  | 13,778,000 |  |  |  |  |  |
Operating lease cost |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |
Total revenues | 35,628,000 | $ 35,912,000 | $ 35,660,000 | $ 36,883,000 | $ 36,932,000 | $ 36,170,000 | $ 41,350,000 | $ 37,568,000 | 144,083,000 | 152,020,000 | 146,008,000 |  |  |  |
Adjustment to opening equity prior period |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Rents [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 113,900,000 | 113,300,000 |  |  |  |
Expense Recoveries [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 33,400,000 | $ 31,200,000 |  |  |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,600,000
2017 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares may be issued under the plan | shares |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 2,000,000 |
Maximum number of shares to be granted per year to a participant | shares |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments useful life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments useful life |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
New London Mall [Member] | New London Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired ownership percentage in joint venture |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |
Percentage of joint venture ownership |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VIE real estate owned carrying value | 37,600,000 |  |  |  |  |  |  |  | $ 37,600,000 |  |  |  |  |  |
Mortgage loan payable | 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Crossroads II [Member] | Other Ownership Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | San Souci Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VIE real estate owned carrying value | 26,200,000 |  |  |  |  |  |  |  | $ 26,200,000 |  |  |  |  |  |
Mortgage loan payable | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |

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