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
Sep. 30, 2020
Dec. 31, 2019
Investing Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier $ 65,862  
2016 0  
2017 948  
2018 0  
2019 11,147  
2020 219  
Total 78,176 $ 73,523
Investing Receivables | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 62,842  
2016 0  
2017 948  
2018 0  
2019 0  
2020 219  
Total 64,009  
Investing Receivables | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 3,020  
2016 0  
2017 0  
2018 0  
2019 11,147  
2020 0  
Total 14,167  
Tenant Notes Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 97  
2016 206  
2017 0  
2018 1,225  
2019 2,063  
2020 1,960  
Total 5,551  
Tenant Notes Receivables | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 0  
2016 27  
2017 0  
2018 1,054  
2019 90  
2020 360  
Total 1,531  
Tenant Notes Receivables | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2015 and Earlier 97  
2016 179  
2017 0  
2018 171  
2019 1,973  
2020 1,600  
Total $ 4,020