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Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2014 USD ($) | Dec. 31, 2017 USD ($) engine | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 25, 2017 | Jun. 03, 2014
Investments |  |  |  |  |  |
Net book value of equipment held for operating lease |  | $ 1,342,571 | $ 1,136,603 |  |  |
Ownership interest (as a percent) |  | 50.00% |  |  |  |
Investment in WMES joint ventures at beginning of the period |  | $ 45,406 | 41,295 | $ 41,590 |  |
Investment |  |  | 5,545 | 630 |  |
Earnings from joint venture |  | 7,158 | 1,813 | 1,175 |  |
Deferred gain on engine sale |  | (939) | (1,212) |  |  |
Distribution |  | (1,880) | (1,167) | (1,304) |  |
Foreign Currency Translation Adjustment |  | (896) | (868) | (796) |  |
Investment in WMES joint ventures at end of the period |  | 50,641 | 45,406 | 41,295 |  |
Property Subject to or Available for Operating Lease, Net |  | 1,342,571 | 1,136,603 |  |  |
Sale of engines |  | $ 43,791 | 62,525 | 41,608 |  |
WMES |  |  |  |  |  |
Investments |  |  |  |  |  |
Number of engines in lease portfolio | engine |  | 32 |  |  |  |
Net book value of equipment held for operating lease |  | $ 230,300 |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |  | 50.00% |
Investment in WMES joint ventures at beginning of the period |  | $ 32,470 | 27,272 | 26,672 |  |
Investment |  |  | 5,545 | 630 |  |
Earnings from joint venture |  | 5,867 | 2,032 | 1,274 |  |
Deferred gain on engine sale |  | (443) | (1,212) |  |  |
Distribution |  | (1,880) | (1,167) | (1,304) |  |
Investment in WMES joint ventures at end of the period |  | 36,014 | 32,470 | 27,272 |  |
Property Subject to or Available for Operating Lease, Net |  | 230,300 |  |  |  |
Engine Value |  | 100 |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |
Revenue |  | 40,211 | 35,463 | 26,909 |  |
Expenses |  | 28,754 | 31,669 | 24,574 |  |
WMES net income |  | 11,457 | 3,794 | 2,335 |  |
Consolidated Balance Sheets |  |  |  |  |  |
Total assets |  | 246,309 | 293,299 |  |  |
Total liabilities |  | 165,228 | 219,881 |  |  |
Total WMES net equity |  | 81,081 | 73,418 |  |  |
WMES | Other Revenue |  |  |  |  |  |
Investments |  |  |  |  |  |
Management fees |  | $ 2,400 | 2,100 | 1,700 |  |
CASC Willis |  |  |  |  |  |
Investments |  |  |  |  |  |
Number of engines in lease portfolio | engine |  | 4 |  |  |  |
Net book value of equipment held for operating lease |  | $ 58,800 |  |  |  |
Investment in WMES joint ventures at beginning of the period |  | 12,936 | 14,023 | 14,918 |  |
Earnings from joint venture |  | 1,291 | (219) | (99) |  |
Deferred gain on engine sale |  | (496) |  |  |  |
Foreign Currency Translation Adjustment |  | (896) | (868) | (796) |  |
Investment in WMES joint ventures at end of the period |  | 14,627 | $ 12,936 | $ 14,023 |  |
Property Subject to or Available for Operating Lease, Net |  | $ 58,800 |  |  |  |
CASC |  |  |  |  |  |
Investments |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 50.00%
Investment | $ 15,000 |  |  |  |  |

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