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Investing Receivables - Investing Receivables (Details) - Investing Receivables - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | $ 89,958 | $ 87,415 |  |
Allowance for credit losses | (3,250) | (2,794) | $ (1,645) | $ (1,599)
Investing receivables, net | 86,708 | 84,621 |  |
Notes receivable from the City of Huntsville |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | 72,544 | 69,703 |  |
Other investing loans receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | $ 17,414 | $ 17,712 |  |

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