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Related Person Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 19, 2017
shares
Sep. 30, 2017
USD ($)
hotel
shares
Sep. 30, 2016
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Travel Centers of America LLC          
Related Party Transaction [Line Items]          
Lessee as percentage of gross carrying value of real estate   35.00%      
Shares included in investment securities (in shares)   3,420,000      
Percentage of total shares outstanding   8.60%      
AIC          
Related Party Transaction [Line Items]          
Carrying value of investments | $   $ 7,952     $ 7,123
Hotel          
Related Party Transaction [Line Items]          
Number of properties owned | hotel   323      
Sonesta agreements | Hotel | Sonesta Int'l Hotels Corp          
Related Party Transaction [Line Items]          
Number of properties owned | hotel   49      
Common Class A | RMR Inc          
Related Party Transaction [Line Items]          
Shares included in investment securities (in shares)   2,503,777      
Forecast | AIC          
Related Party Transaction [Line Items]          
Real estate insurance | $       $ 6,352  
Officers and other employees | Common Stock          
Related Party Transaction [Line Items]          
Shares granted in period (in shares)   85,000 79,100    
Shares repurchased (in shares) 18,559 18,559 19,677