Quarterly report pursuant to Section 13 or 15(d)

Investing Receivables - Investing Receivables (Details)

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Investing Receivables - Investing Receivables (Details) - Investing Receivables - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
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