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Summary of Significant Accounting Policies - Credit Risk Classification (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investing Receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | $ 62,853 |
2016 | 0 |
2017 | 866 |
2018 | 0 |
2019 | 11,076 |
2020 | 0 |
Total as of March 31, 2020 | 74,795 | $ 73,523
Investing Receivables | Investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 59,833 |
2016 | 0 |
2017 | 866 |
2018 | 0 |
2019 | 0 |
2020 | 0 |
Total as of March 31, 2020 | 60,699 |
Investing Receivables | Non-investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 3,020 |
2016 | 0 |
2017 | 0 |
2018 | 0 |
2019 | 11,076 |
2020 | 0 |
Total as of March 31, 2020 | 14,096 |
Tenant Notes Receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 118 |
2016 | 297 |
2017 | 0 |
2018 | 1,285 |
2019 | 2,179 |
2020 | 0 |
Total as of March 31, 2020 | 3,879 |
Tenant Notes Receivables | Investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 21 |
2016 | 78 |
2017 | 0 |
2018 | 1,100 |
2019 | 100 |
2020 | 0 |
Total as of March 31, 2020 | 1,299 |
Tenant Notes Receivables | Non-investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 97 |
2016 | 219 |
2017 | 0 |
2018 | 185 |
2019 | 2,079 |
2020 | 0 |
Total as of March 31, 2020 | $ 2,580 |

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