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Credit Losses, Financial Assets and Other Instruments (Credit Risk Classification) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investing Receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | $ 64,354 |
2016 | 0 |
2017 | 971 |
2018 | 0 |
2019 | 6,041 |
2020 | 239 |
Total | 71,605 | $ 73,523
Investing Receivables | Investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 64,354 |
2016 | 0 |
2017 | 971 |
2018 | 0 |
2019 | 0 |
2020 | 239 |
Total | 65,564 |
Investing Receivables | Non-investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 0 |
2016 | 0 |
2017 | 0 |
2018 | 0 |
2019 | 6,041 |
2020 | 0 |
Total | 6,041 |
Tenant Notes Receivables |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 97 |
2016 | 179 |
2017 | 0 |
2018 | 1,192 |
2019 | 1,967 |
2020 | 2,146 |
Total | 5,581 |
Tenant Notes Receivables | Investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 0 |
2016 | 14 |
2017 | 0 |
2018 | 1,028 |
2019 | 84 |
2020 | 343 |
Total | 1,469 |
Tenant Notes Receivables | Non-investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 97 |
2016 | 165 |
2017 | 0 |
2018 | 164 |
2019 | 1,883 |
2020 | 1,803 |
Total | 4,112 |
Sales-Type Lease Receivables | Investment grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2015 and Earlier | 0 |
2016 | 0 |
2017 | 0 |
2018 | 0 |
2019 | 0 |
2020 | 6,573 |
Total | $ 6,573 |

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