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Real Estate Properties - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
hotel
travelcenter
Sep. 30, 2016
USD ($)
Real Estate Properties [Line Items]    
Improvements to certain properties $ 89,955 $ 122,239
Hotels and travel centers    
Real Estate Properties [Line Items]    
Improvements to certain properties 111,966  
Increase (decrease) in annual minimum returns and rents $ 7,132  
Hotel    
Real Estate Properties [Line Items]    
Number of properties owned | hotel 323  
Number of properties acquired | hotel 20  
Travel centers    
Real Estate Properties [Line Items]    
Number of properties owned | travelcenter 199  
Number of properties acquired | travelcenter 1