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Investing Receivables - Investing Receivables (Details) - Investing Receivables - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | $ 84,093 | $ 83,825 |  |
Allowance for credit losses | (1,676) | (1,599) | $ (2,080) | $ (2,851)
Investing receivables, net | 82,417 | 82,226 |  |
Notes receivable from the City of Huntsville |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | 79,053 | 77,784 |  |
Other investing loans receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized cost basis | $ 5,040 | $ 6,041 |  |

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