3. Rental Properties [Abstract]

No definition available.

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- Definition

Mortgage Note Receivable from Property Sale

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No definition available.

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- Definition

Number of Reportable Operating Segments

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No definition available.

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- Definition

number of properties sold

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No definition available.

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- Definition

Percentage of Lease Revenue in Total Revenue

+ References

No definition available.

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- Definition

Range of settlement date for shares for non-employee trustee from grant date, minimum

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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-Subparagraph (SAB Topic 14.F)
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-Subparagraph (h)(1)(i)
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Name Accounting Standards Codification
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-Section 50
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- References

No definition available.

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- Definition

The carrying amount of deferred costs.

+ References

No definition available.

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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
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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
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- References

No definition available.

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- References

No definition available.

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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.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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No definition available.

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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.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

+ References

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Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) properties
Operating Segments
Number of Reportable Operating Segments \| segment	4
Revenue Recognition [Abstract]
Straight Line Rent	$ 1,900	$ 5,100
Percentage rents	1,300	800
Concentrations of Risk [Abstract]
Rental revenue	128,933	107,037
Share-based Compensation [Abstract]
Share based compensation	$ 3,791	3,458
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	$ 28,600		$ 32,900
American Multi-Cinema, Inc. [Member]
Concentrations of Risk [Abstract]
Percent of megaplex theatre rental leased by AMC	38.00%
Rental revenue	$ 28,600	$ 29,200
Percentage of lease revenue in total revenue	18.40%	22.70%
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	$ 73	$ 194
Restricted Stock [Member]
Share-based Compensation [Abstract]
Share based compensation expense related to employees and trustees	$ 3,400	3,000
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	$ 337	280
Education Reportable Operating Segment [Member]
Concentrations of Risk [Abstract]
Rental revenue	$ 22,380	$ 22,357
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