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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

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