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Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Property
Real Estate And Accumulated Depreciation [Line Items]    
Number of property locations of investments 665 508
Number of owned properties 652 493
Number of ground lease interests 13 15
Number of real estate subject to direct financing leases 1 1
Intangible lease assets | $ $ 66,421 $ 62,453
Construction in progress | $ 1,325 4,076
Aggregate cost for federal income tax | $ 1,400,000  
Principal outstanding | $ $ 515,100 $ 522,900
Buildings and Improvements | Maximum    
Real Estate And Accumulated Depreciation [Line Items]    
Estimated useful life 40 years  
Site Improvements    
Real Estate And Accumulated Depreciation [Line Items]    
Estimated useful life 15 years  
Single Tenant Real Estate Property    
Real Estate And Accumulated Depreciation [Line Items]    
Number of property locations of investments 665  
Number of owned properties 652  
Number of ground lease interests 13  
Number of real estate subject to direct financing leases 5  
Number of real estate subject to ground leasedirect financing leases 1  
Intangible lease assets | $ $ 65,500  
Construction in progress | $ $ 1,300