Quarterly report pursuant to Section 13 or 15(d)

Investing Receivables (Details)

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Investing Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 69,390 $ 56,982
Investing Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Fair value of investing receivables 74,000 58,000
Notes Receivable from the City of Huntsville    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 55,293 53,961
Notes Receivable from the City of Huntsville | LW Redstone Company, LLC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Stated interest rate (as a percent) 9.95%  
Other investing loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investing receivables $ 14,097 $ 3,021
Stated interest rate (as a percent) 8.00%