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Revenues - Contract Balances (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Contract Assets Activity [Roll Forward] |  |  |  |
Balance at beginning of period | $ 460,000 |  |  |
Tenant openings | (151,000) |  |  |
Executed leases | 212,000 |  |  |
Balance at end of period | 521,000 |  |  |
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 | $ 521,000 |  | $ 460,000
Contract with customer - asset - remainder of 2018 |  | (366,000) |  |
Contract with customer - asset - 2019 |  | (151,000) |  |
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, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | 0 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer - liability |  | $ (49,000) |  |
Expected timing of satisfaction of remaining performance obligation |  | 6 months |  |
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]: 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 |  |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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