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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Property management fee | $ 637 | $ 714 | $ 1,365 | $ 1,455 |
Asset management fee | 259 | 304 | 562 | 607 |
Leasing commissions and other fees | 28 | 84 | 73 | 132 |
Other fee income | 924 | $ 1,102 | 2,000 | $ 2,194 |
Receivables | $ 479 |  | $ 479 |  | $ 515

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- Definition Leasing Commission and Other Fees Revenue + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_ManagementFeesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeeRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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