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Investments - Summarized Financial Information (Details) - WMES - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |  |
Revenue | $ 13,007 | $ 9,987 | $ 36,144 | $ 26,633 |
Expenses | 9,657 | 8,408 | 27,378 | 22,762 |
WMES income before income taxes | 3,350 | $ 1,579 | 8,766 | $ 3,871 |
Statement of Financial Position [Abstract] |  |  |  |  |
Total assets | 313,073 |  | 313,073 |  | $ 274,744
Total liabilities | 225,727 |  | 225,727 |  | 198,534
Total WMES net equity | $ 87,346 |  | $ 87,346 |  | $ 76,210

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