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Other Assets - Allowance For Credit Losses Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Interest receivable less than | $ 100,000 |  | $ 100,000 |  | $ 100,000
Interest income recognized for notes receivables in nonaccrual status | 0 | $ 0 | 0 | $ 0 |
Prepaid expense | 12,000,000.0 |  | 12,000,000.0 |  | 8,400,000
Notes Receivable |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual notes receivable without related allowance for credit loss | 0 |  | 0 |  | 0
Notes receivable 90 days or more past due still accruing | $ 0 |  | $ 0 |  | $ 0

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