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Investing Receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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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% |

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