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Investing Receivables - Investing Receivables (Details) - Investing Receivables - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized cost basis | $ 73,911 | $ 71,605
Allowance for credit losses | (2,080) | (2,851)
Investing receivables, net | 71,831 | 68,754
Notes receivable from the City of Huntsville |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized cost basis | 67,870 | 65,564
Other investing loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized cost basis | $ 6,041 | $ 6,041

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