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Leases - Net Investment in Finance Leases (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |
Future minimum lease payment receivable | $ 1,380,331 | $ 355,755
Estimated residual receivable | 146,428 | 53,892
Gross finance lease receivables | 1,526,759 | 409,647
Unearned income | (510,461) | (127,516)
Net investment in finance leases | $ 1,016,298 | $ 282,131
Customer One | Customer Concentration Risk | Lease Finance Portfolio Benchmark |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 89.00% | 75.00%

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