3. Rental Properties [Abstract]

No definition available.

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- Definition

Participating interest income.

+ References

No definition available.

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- Definition

Number of Reportable Operating Segments

+ References

No definition available.

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- Definition

Percentage of Lease Revenue in Total Revenue

+ References

No definition available.

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- Definition

Prepaymentfee

+ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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-Paragraph 21
-Subparagraph (a)
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- References

No definition available.

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- Definition

The carrying amount of deferred costs.

+ References

No definition available.

+ Details

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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=7501430&loc=d3e39896-112707

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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))
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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.

+ Details

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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- References

No definition available.

+ Details

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

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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

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

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- References

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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-SubTopic 10
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- Definition

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

+ References

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Summary of Significant Accounting Policies (Details)	3 Months Ended
Summary of Significant Accounting Policies (Details)	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Operating Segments
Number of Reportable Operating Segments \| segment	4
Revenue Recognition [Abstract]
Percentage rents	$ 600,000	$ 300,000
Mortgage And Other Participating Interest Income	0	0
Concentrations of Risk [Abstract]
Rental revenue	93,778,000	76,740,000
Total revenue	118,768,000	99,436,000
Share-based Compensation [Abstract]
Share based compensation	$ 2,765,000	1,972,000
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	$ 1,600,000
Share-based compensation expense included in retirement severance expense	0	6,377,000
Retirement severance expense	0	18,578,000
Deferred Costs	17,500,000		$ 18,300,000
Prepaymentfee	$ 3,600,000
American Multi-Cinema, Inc. [Member]
Concentrations of Risk [Abstract]
Percent of megaplex theatre rental leased by AMC	25.00%
Rental revenue	$ 21,800,000	$ 21,400,000
Percentage of lease revenue in total revenue	18.00%	21.00%
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
Share Options [Member]
Share-based Compensation [Abstract]
Share based compensation, future vesting period minimum (in years)	4 years
Stock-option expense	$ 237,000	$ 274,000
Restricted Stock [Member]
Share-based Compensation [Abstract]
Share based compensation expense related to employees and trustees	$ 2,300,000	1,400,000
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	$ 260,000	264,000
Chief Executive Officer [Member] \| Accelerated Vesting of Shares [Member] \| Employee Severance [Member] \| Share Options [Member]
Share-based Compensation [Abstract]
Retirement severance expense		1,400,000
Chief Executive Officer [Member] \| Accelerated Vesting of Shares [Member] \| Employee Severance [Member] \| Nonvested Shares [Member]
Share-based Compensation [Abstract]
Retirement severance expense		$ 5,000,000