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Net Investment in Sales-type Leases, Ground Lease Receivables and Loans Receivable, net - Related Party (Interest Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases | [1] | $ 59,130 | $ 54,736 | $ 174,350 | $ 146,014
Cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 38,076 | 34,841 | 112,211 | 92,459
Non-cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 21,054 | 19,895 | 62,139 | 53,555
Net Investment in Sales-type Leases |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 39,791 | 38,364 | 118,416 | 104,810
Net Investment in Sales-type Leases | Cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 25,309 | 24,256 | 75,355 | 66,017
Net Investment in Sales-type Leases | Non-cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 14,482 | 14,108 | 43,061 | 38,793
Ground Lease Receivables |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 19,339 | 16,372 | 55,934 | 41,204
Ground Lease Receivables | Cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | 12,767 | 10,585 | 36,856 | 26,442
Ground Lease Receivables | Non-cash |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Interest income from sales-type leases |  | $ 6,572 | $ 5,787 | $ 19,078 | $ 14,762
[1] | For the nine months ended September 30, 2022, the Company recorded $2.1 million of “Interest income from sales-type leases” in its consolidated statements of operations from Ground Leases with iStar Inc. (“iStar”).

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