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Real Estate Leases - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
state
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Concentration Risk [Line Items]      
Number of states in which real estate investments are in | state 26    
Real estate investment property, net $ 352,350 $ 234,332  
Straight line rent 1,303 606 $ 133
Operating expense recovery 5,100 4,600 2,000
Rental income, late fees $ 149 228 40
Twenty-Six States [Member] | Geographic Concentration Risk [Member] | Real Estate Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 36.50%    
Florida [Member] | Geographic Concentration Risk [Member] | Real Estate Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 10.80%    
Illinois [Member] | Geographic Concentration Risk [Member] | Real Estate Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 13.50%    
Ohio [Member] | Geographic Concentration Risk [Member] | Real Estate Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk percentage 12.20%    
Two Real Estate Properties [Member]      
Concentration Risk [Line Items]      
Real estate investment property, net $ 6,300    
Other Liabilities [Member]      
Concentration Risk [Line Items]      
Deferred revenue $ 1,100 $ 800 $ 500