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Revenues - Contract Balances (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Contract Assets Activity [Roll Forward] |  |  |  |
Balance at beginning of period | $ 460,000 |  |  |
Tenant openings | (375,000) |  |  |
Executed leases | 525,000 |  |  |
Balance at end of period | 610,000 |  |  |
Investments in unconsolidated affiliates |  |  |  | $ 166,000
Increase (decrease) in contract with customer liability | 0 |  |  |
Contract with Customer, Liability [Abstract] |  |  |  |
Contract with customer - asset | $ 460,000 | $ 610,000 |  | $ 460,000
Contract with customer - asset - remainder of 2018 |  | (213,000) |  |
Contract with customer - asset - 2019 |  | (389,000) |  |
Contract with customer - asset - 2020 |  | (4,000) |  |
Contract with customer - asset - 2023 |  | (4,000) |  |
Contract with customer - liability |  | 98,000 | $ 98,000 |
Lease commission recognized upon tenant opening (as a percent) | 50.00% |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (49,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 3 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-02 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (981,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 5 years |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (49,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ 0 |  |
Expected timing of satisfaction of remaining performance obligation |  | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ 0 |  |
Expected timing of satisfaction of remaining performance obligation |  | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (4,899,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 15 years |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2038-10-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (33,581,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 0 years |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2038-10-02 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (39,461,000) |  |
Expected timing of satisfaction of remaining performance obligation |  |  |  |

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