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Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) properties | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) segment properties | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 USD ($)
Allowance for Loan and Lease Losses, Write-offs |  |  | $ 3,800 |  |  |
Loss Contingency, Estimate of Possible Loss | $ 7,900 |  | $ 7,900 |  |  | $ 7,900
Operating Segments |  |  |  |  |  |
Number of Reportable Operating Segments | segment |  |  | 4 |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |
Percentage rents |  |  | $ 1,800 | $ 1,700 |  |
Mortgage And Other Participating Interest Income |  |  | 1,500 | 1,400 |  |
Gain (Loss) on Contract Termination |  |  | 127 | 100 |  |
Concentrations of Risk [Abstract] |  |  |  |  |  |
Rental revenue | 85,706 | $ 74,410 | 240,306 | 210,759 |  |
Total revenue | 108,335 | 98,738 | 309,029 | 280,381 |  |
Share-based Compensation [Abstract] |  |  |  |  |  |
Share based compensation |  |  | $ 6,218 | 6,984 |  |
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 |  |  | $ 2,200 |  |  |
Share-based compensation expense included in retirement severance expense |  |  | 6,377 | 0 |  |
Retirement severance expense | $ 0 | $ 0 | $ 18,578 | 0 |  |
American Multi-Cinema, Inc. [Member] |  |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |  |
Percent of megaplex theatre rental leased by AMC |  |  | 26.00% |  |  |
Rental revenue |  |  | $ 64,300 | $ 65,500 |  |
Percentage of lease revenue in total revenue |  |  | 21.00% | 23.00% |  |
ONTARIO | Entertainment Retail Center Properties [Member] |  |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |  |
Number of real estate properties (in properties) | properties | 4 |  | 4 |  |  |
ONTARIO | Four Entertainment Retail Centers [Member] |  |  |  |  |  |
Concentrations of Risk [Abstract] |  |  |  |  |  |
Percentage of lease revenue in total revenue |  |  | 8.00% | 11.00% |  |
Total revenue |  |  | $ 25,500 | $ 30,200 |  |
Net assets of wholly owned subsidiaries | $ 175,700 |  | $ 175,700 |  | $ 200,400 |
Wholly owned subsidiaries percentage in net assets |  |  | 9.00% |  | 10.00% |
Minimum [Member] |  |  |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies | 6,500 |  | $ 6,500 |  |  | 6,500
Loss Contingency, Accrual, Current | $ 1,400 |  | $ 1,400 |  |  | $ 1,400
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 |  |  | $ 830 | 1,100 |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |
Share based compensation expense related to employees and trustees |  |  | $ 4,600 | 5,100 |  |
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 |  |  | $ 784 | $ 797 |  |
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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