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Investments - Additional Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) engine aircraft. | Mar. 31, 2018 USD ($) aircraft. | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Net book value of equipment held for operating lease | $ 1,605,120 |  | $ 1,673,135
Investment in joint ventures at beginning of the period | 47,941 |  |
Earnings from joint ventures | 946 |  |
Investment | (5,013) | $ 0 |
Foreign currency translation adjustment | 353 |  |
Investment in joint ventures at end of the period | 54,253 |  |
Management fees included in other revenue | $ 2,978 | $ 1,882 |
WMES |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest | 50.00% |  |
Number of engines in lease portfolio | engine | 33 |  |
Number of aircraft in lease portfolio | aircraft. | 6 |  |
Net book value of equipment held for operating lease | $ 318,400 |  |
Investment in joint ventures at beginning of the period | 34,183 |  |
Earnings from joint ventures | 747 |  |
Investment | (5,013) |  |
Foreign currency translation adjustment | 0 |  |
Investment in joint ventures at end of the period | $ 39,943 |  |
Number of aircrafts sold | aircraft. | 5 | 1 |
Number of engines sold | aircraft. |  | 1 |
Proceeds from sale of engines | $ 75,500 | $ 21,400 |
WMES | Asset Management |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Management fees included in other revenue | $ 600 | $ 700 |
CASC Willis |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest | 50.00% |  |
Number of engines in lease portfolio | engine | 4 |  |
Net book value of equipment held for operating lease | $ 52,700 |  |
Investment in joint ventures at beginning of the period | 13,758 |  |
Earnings from joint ventures | 199 |  |
Investment | 0 |  |
Foreign currency translation adjustment | 353 |  |
Investment in joint ventures at end of the period | $ 14,310 |  |

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- Definition The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
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