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Credit Losses, Financial Assets and Other Instruments (Credit Risk Classification) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investing Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	$ 70,434
2017	1,069
2018	0
2019	6,041
2020	1,675
2021	4,606
Total	83,825	$ 71,605
Investing Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	70,434
2017	1,069
2018	0
2019	0
2020	1,675
2021	4,606
Total	77,784
Investing Receivables | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	0
2017	0
2018	0
2019	6,041
2020	0
2021	0
Total	6,041
Tenant Notes Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	207
2017	0
2018	1,053
2019	200
2020	1,995
2021	0
Total	3,455
Tenant Notes Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	0
2017	0
2018	921
2019	63
2020	271
2021	0
Total	1,255
Tenant Notes Receivables | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	207
2017	0
2018	132
2019	137
2020	1,724
2021	0
Total	2,200
Sales-Type Lease Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2016 and Earlier	0
2017	0
2018	0
2019	0
2020	6,194
2021	0
Total	$ 6,194

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