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Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) properties
Operating Segments |  |  |  |  |
Number of Reportable Operating Segments | segment |  |  | 4 |  |
Revenue Recognition [Abstract] |  |  |  |  |
Straight Line Rent |  |  | $ 3,900 | $ 9,100 |
Tenant Reimbursements |  |  | 7,700 | 7,700 |
Percentage rents |  |  | 3,000 | 2,500 |
Concentrations of Risk [Abstract] |  |  |  |  |
Rental revenue | $ 137,019 | $ 123,410 | 269,943 | 234,196 |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation |  |  | $ 7,608 | 6,961 |
Share based compensation, future vesting period minimum (in years) |  |  | 4 years |  |
Range of settlement date for shares for non-employee trustee from grant date, minimum (in years) |  |  | 1 year |  |
Share based compensation expense related to employees and trustees |  |  | $ 200 |  |
Deferred Costs | 36,000 |  | $ 36,000 |  | $ 32,900
American Multi-Cinema, Inc. [Member] |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |
Percent of megaplex theatre rental leased by AMC |  |  | 34.00% |  |
Rental revenue |  |  | $ 57,400 | $ 57,600 |
Percentage of lease revenue in total revenue |  |  | 16.00% | 20.80% |
Minimum [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation, future vesting period minimum (in years) |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation, future vesting period minimum (in years) |  |  | 4 years |  |
Building [Member] | Minimum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 30 years |  |
Building [Member] | Maximum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 40 years |  |
Furniture, fixtures & equipment [Member] | Minimum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 3 years |  |
Furniture, fixtures & equipment [Member] | Maximum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 25 years |  |
Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 10 years |  |
Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Rental Properties [Abstract] |  |  |  |  |
Estimated useful live of buildings (in years) |  |  | 20 years |  |
Share Options [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation, future vesting period minimum (in years) |  |  | 4 years |  |
Stock-option expense |  |  | $ 147 | $ 361 |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation expense related to employees and trustees |  |  | $ 6,900 | 6,000 |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation, future vesting period minimum (in years) |  |  | 3 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation, future vesting period minimum (in years) |  |  | 4 years |  |
Restricted Share Units [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Range of settlement date for shares for non-employee trustee from grant date, minimum (in years) |  |  | 1 year |  |
Restricted Share Units [Member] | Non-Employee Trustees [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation expense related to employees and trustees |  |  | $ 570 | 599 |
Education Reportable Operating Segment [Member] |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |
Rental revenue | $ 25,649 | $ 22,333 | $ 48,034 | $ 44,690 |
Education Reportable Operating Segment [Member] | Education Property Member |  |  |  |  |
number of properties sold | properties |  |  |  |  | 2
Share-based Compensation [Abstract] |  |  |  |  |
Mortgage Note Receivable from Property Sale |  |  |  |  | $ 12,300

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others. + 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(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Difference between actual rental income due and rental income recognized on a straight-line basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + 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(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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