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Other income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Component of Operating Income [Line Items] |  |  |  |  |  |
Management fees | $ 13,426 |  | $ 18,298 |  | $ 23,094 |
Interest and other income | 81,172 | [1] | 127,688 | [2] | 89,582 | [3]
Total other income | 94,598 |  | 145,986 |  | 112,676 |
Income from lease termination | $ 46,500 |  | 63,200 |  |  |
Income from net insurance proceeds |  |  | 54,200 |  | 16,200 |
Gain on refinance of notes receivable |  |  | 27,700 |  |  |
Gain from the settlement of asset value guarantees |  |  |  |  | 22,600 |
AeroTurbine, Inc. [Member] |  |  |  |  |  |
Component of Operating Income [Line Items] |  |  |  |  |  |
Expense related to a lower of cost or market adjustment of parts inventory |  |  | $ 36,000 |  | $ 38,700 |
[1] | Includes income from lease terminations of $46.5 million.
[2] | Includes income from lease terminations of $63.2 million, net insurance proceeds of $54.2 million and a gain related to the repayment of a note receivable earlier than expected of $27.7 million. In addition, we incurred an expense of $36.0 million related to a lower of cost or market adjustment of AeroTurbine’s parts inventory as a result of the AeroTurbine downsizing. Please refer to Note 25—AeroTurbine restructuring.
[3] | Includes income from net insurance proceeds of $16.2 million and the settlement of asset value guarantees of $22.6 million. In addition, we incurred an expense of $38.7 million related to a lower of cost or market adjustment of AeroTurbine’s parts inventory as a result of the AeroTurbine downsizing. Please refer to Note 25—AeroTurbine restructuring.

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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