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Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Revenue |  | $ 70,613 | $ 120,366 | $ 227,205 | $ 319,932 |  |  |  |
Expenses |  | 66,031 | 91,453 | 205,510 | 244,022 |  |  |  |
Net income |  | 2,984 | 24,073 | 12,642 | 61,926 |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |  |  |  |
Total assets | [1] | 2,149,223 |  | 2,149,223 |  |  | $ 1,940,608 |  |
Total liabilities | [2] | 1,735,227 |  | 1,735,227 |  |  | 1,540,632 |  |
Total WMES net equity |  | 364,295 | 345,493 | 364,295 | 345,493 | $ 357,868 | 350,338 | $ 320,413 | $ 286,787
WMES |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Revenue |  | 9,610 | 13,007 | 29,525 | 36,144 |  |  |  |
Expenses |  | 7,539 | 10,076 | 25,718 | 28,436 |  |  |  |
Net income |  | 2,071 | $ 2,931 | 3,807 | $ 7,708 |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |  |  |  |
Total assets |  | 310,722 |  | 310,722 |  |  | 322,606 |  |
Total liabilities |  | 225,761 |  | 225,761 |  |  | 227,052 |  |
Total WMES net equity |  | $ 84,961 |  | $ 84,961 |  |  | $ 95,554 |  |
[1] | Total assets at September 30, 2020 and December 31, 2019, respectively, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Cash nil and $134; Restricted cash $66,317 and $56,523; Equipment $1,081,757 and $1,004,851; Maintenance Rights $767 and $3,133; Inventory $4,367 and $2,832; and Other assets $1,240 and $668, respectively.
[2] | Total liabilities at September 30, 2020 and December 31, 2019, respectively, include the following liabilities of VIEs for which the VIEs’ creditors do not have recourse to Willis Lease Finance Corporation: Debt obligations $935,064 and $842,996, respectively.

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