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Investments - Summarized Financial Information (Details) - WMES - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Statement [Abstract] |  |  |
Revenue | $ 9,543 | $ 7,606 |
Expenses | 8,205 | 6,904 |
WMES income before income taxes | 1,338 | $ 702 |
Statement of Financial Position [Abstract] |  |  |
Total assets | 325,763 |  | $ 274,744
Total liabilities | 238,318 |  | 198,534
Total WMES net equity | $ 87,445 |  | $ 76,210

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