Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Credit Risk Classification (Details)

v3.20.2
Summary of Significant Accounting Policies - Credit Risk Classification (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investing Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier $ 64,349  
2016 0  
2017 887  
2018 0  
2019 11,073  
2020 0  
Total 76,309 $ 73,523
Investing Receivables | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 61,329  
2016 0  
2017 887  
2018 0  
2019 0  
2020 0  
Total 62,216  
Investing Receivables | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 3,020  
2016 0  
2017 0  
2018 0  
2019 11,073  
2020 0  
Total 14,093  
Tenant Notes Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 97  
2016 270  
2017 0  
2018 1,247  
2019 2,162  
2020 1,600  
Total 5,376  
Tenant Notes Receivables | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 0  
2016 68  
2017 0  
2018 1,069  
2019 95  
2020 0  
Total 1,232  
Tenant Notes Receivables | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 97  
2016 202  
2017 0  
2018 178  
2019 2,067  
2020 1,600  
Total $ 4,144