Annual report pursuant to Section 13 and 15(d)

Investing Receivables (Details)

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Investing Receivables (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 73,523 $ 56,982
Investing Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fair value of investing receivables 74,000 58,000
Notes receivable from City of Huntsville    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 59,427 53,961
Notes receivable from City of Huntsville | LW Redstone Company, LLC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Stated interest rate 9.95%  
Note receivable, term 30 years  
Other investing loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 14,096 $ 3,021
Stated interest rate 8.00%