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Investments - Summarized Financial Information (Details) - WMES - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Income Statement [Abstract] |  |  |  |  |
Revenue | $ 11,804 | $ 13,594 | $ 19,915 | $ 23,137 |
Expenses | 10,425 | 10,025 | 18,179 | 18,398 |
WMES net income | 1,379 | $ 3,569 | 1,736 | $ 4,739 |
Statement of Financial Position [Abstract] |  |  |  |  |
Total assets | 329,540 |  | 329,540 |  | $ 322,606
Total liabilities | 232,250 |  | 232,250 |  | 227,052
Total WMES net equity | $ 97,290 |  | $ 97,290 |  | $ 95,554

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