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Investments - Summarized Financial Information (Details) - WMES - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |  |
Revenue | $ 13,594 | $ 9,040 | $ 23,137 | $ 16,646 |
Expenses | 9,516 | 7,551 | 17,721 | 14,354 |
WMES income before income taxes | 4,078 | $ 1,489 | 5,416 | $ 2,292 |
Statement of Financial Position [Abstract] |  |  |  |  |
Total assets | 315,173 |  | 315,173 |  | $ 274,744
Total liabilities | 230,759 |  | 230,759 |  | 198,534
Total WMES net equity | $ 84,414 |  | $ 84,414 |  | $ 76,210

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