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Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Operating Segments |  |  |  |  |
Number of Reportable Operating Segments | segment |  |  | 4 |  |
Revenue Recognition [Abstract] |  |  |  |  |
Percentage rents |  |  | $ 2,700 | $ 1,800 |
Mortgage And Other Participating Interest Income |  |  | 900 | 1,500 |
Prepaymentfee |  |  | 3,600 |  |
Concentrations of Risk [Abstract] |  |  |  |  |
Rental revenue | $ 102,282 | $ 85,706 | 292,115 | 240,306 |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation |  |  | $ 8,282 | 6,218 |
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 |  |  | $ 1,200 |  |
Deferred Costs | 18,900 |  | 18,900 |  | $ 18,300
Share-based compensation expense included in retirement severance expense |  |  | 0 | 6,377 |
Retirement severance expense | $ 0 | $ 0 | $ 0 | 18,578 |
American Multi-Cinema, Inc. [Member] |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |
Percent of megaplex theatre rental leased by AMC |  |  | 24.00% |  |
Rental revenue |  |  | $ 65,300 | $ 64,300 |
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 |  |  | $ 684 | $ 830 |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Share based compensation expense related to employees and trustees |  |  | $ 6,800 | 4,600 |
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 |  |  | $ 813 | 784 |
Chief Executive Officer [Member] | Accelerated Vesting of Shares [Member] | Employee Severance [Member] | Share Options [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Retirement severance expense |  |  |  | 1,400 |
Chief Executive Officer [Member] | Accelerated Vesting of Shares [Member] | Employee Severance [Member] | Nonvested Shares [Member] |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |
Retirement severance expense |  |  |  | $ 5,000 |

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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 + 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 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 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=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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