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Investing Receivables - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Investing Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable, fair value disclosure | $ 75,000 | $ 73,000
Investing Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable, net of allowance for credit losses | $ 601 | $ 4,800
Investing Receivables | Other investing loans receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest rate | 8.00% |
Investing Receivables | LW Redstone Company LLC | Notes receivable from the City of Huntsville |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest rate | 9.95% |

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