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Investments (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) engine aircraft | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | May 25, 2011
Investments |  |  |  |  |  |
Net book value of equipment held for operating lease | $ 1,542,329 |  | $ 1,542,329 |  | $ 1,342,571 |
Investment in WMES joint ventures at beginning of the period |  |  | 50,641 |  |  |
Earnings from joint venture |  |  | 1,063 |  |  |
Deferred gain on engine sale |  |  | (723) |  |  |
Foreign Currency Translation Adjustment |  |  | (232) |  |  |
Investment in WMES joint ventures at end of the period | 50,749 |  | $ 50,749 |  |  |
Revenue | 1,871 |  |  |  |  |
WMES |  |  |  |  |  |
Investments |  |  |  |  |  |
Number of engines in lease portfolio | engine |  |  | 34 |  |  |
Number of aircraft in lease portfolio | aircraft |  |  | 1 |  |  |
Net book value of equipment held for operating lease | $ 266,300 |  | $ 266,300 |  |  |
Ownership interest (as a percent) | 100.00% |  | 100.00% |  |  | 50.00%
Investment in WMES joint ventures at beginning of the period |  |  | $ 36,014 |  |  |
Earnings from joint venture |  |  | 1,090 |  |  |
Deferred gain on engine sale |  |  | (723) |  |  |
Investment in WMES joint ventures at end of the period | $ 36,381 |  | 36,381 |  |  |
Condensed Consolidated Statements of Income |  |  |  |  |  |
Revenue | 9,040 | $ 8,199 | 16,646 | $ 19,860 |  |
Expenses | 7,551 | 6,700 | 14,354 | 15,129 |  |
WMES net income | 1,489 | 1,499 | 2,292 | 4,731 |  |
Condensed Consolidated Balance Sheets |  |  |  |  |  |
Total assets | 282,826 |  | 282,826 |  | 246,309 |
Total liabilities | 199,741 |  | 199,741 |  | 165,228 |
Total WMES net equity | 83,085 |  | 83,085 |  | $ 81,081 |
WMES | Other Revenue | Asset Management |  |  |  |  |  |
Investments |  |  |  |  |  |
Revenue | 500 | $ 500 | $ 1,200 | $ 1,300 |  |
CASC Willis |  |  |  |  |  |
Investments |  |  |  |  |  |
Number of engines in lease portfolio | engine |  |  | 4 |  |  |
Net book value of equipment held for operating lease | $ 57,200 |  | $ 57,200 |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |  |  |
Investment in WMES joint ventures at beginning of the period |  |  | $ 14,627 |  |  |
Earnings from joint venture |  |  | (27) |  |  |
Foreign Currency Translation Adjustment |  |  | (232) |  |  |
Investment in WMES joint ventures at end of the period | $ 14,368 |  | $ 14,368 |  |  |

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