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Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Operating Segments      
Number of Reportable Operating Segments | segment 4    
Revenue Recognition [Abstract]      
Percentage rents $ 800 $ 600  
Prepaymentfee   3,600  
Concentrations of Risk [Abstract]      
Rental revenue 107,037 93,778  
Share-based Compensation [Abstract]      
Share based compensation $ 3,458 2,765  
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 $ 800    
Deferred Costs $ 28,200   $ 29,300
American Multi-Cinema, Inc. [Member]      
Concentrations of Risk [Abstract]      
Percent of megaplex theatre rental leased by AMC 35.00%    
Rental revenue $ 29,200 $ 21,800  
Percentage of lease revenue in total revenue 22.70% 18.30%  
Carmike Cinemas, Inc [Member]      
Concentrations of Risk [Abstract]      
Rental revenue   $ 4,900  
Percentage of lease revenue in total revenue   4.10%  
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 $ 194 $ 237  
Restricted Stock [Member]      
Share-based Compensation [Abstract]      
Share based compensation expense related to employees and trustees $ 3,000 2,300  
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 $ 280 $ 260