Credit Losses, Financial Assets and Other Instruments (Credit Risk Classification) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investing Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	$ 71,682
2018	0
2019	5,040
2020	1,715
2021	5,656
Total	84,093	$ 83,825
Investing Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	71,682
2018	0
2019	0
2020	1,715
2021	5,656
Total	79,053
Investing Receivables | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	0
2018	0
2019	5,040
2020	0
2021	0
Total	5,040
Tenant Notes Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	194
2018	1,012
2019	184
2020	1,937
2021	0
Total	3,327
Tenant Notes Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	0
2018	888
2019	58
2020	252
2021	0
Total	1,198
Tenant Notes Receivables | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	194
2018	124
2019	126
2020	1,685
2021	0
Total	2,129
Sales-Type Lease Receivables | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2017 and Earlier	0
2018	0
2019	0
2020	6,065
2021	0
Total	$ 6,065