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Investments | 12 Months Ended
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Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Investments | Investments Investments accounted for under the equity method of accounting consisted of the following as of December 31, 2017 and 2016:
| Ownership as of December 31, 2017 |  | As of December 31,
| (%) |  | 2017 |  | 2016
AerDragon | 16.7 |  | $ | 61,706 |  |  | $ | 60,124 |
AerLift | 39.3 |  | 44,930 |  |  | 45,087 |
ACSAL | 19.4 |  | 14,197 |  |  | 13,566 |
|  |  | $ | 120,833 |  |  | $ | 118,777 |
Our share of undistributed earnings of investments in which our ownership interest is less than 50% was $40.2 million and $38.4 million as of December 31, 2017 and 2016, respectively. We also have an investment in Peregrine of $2.1 million as of December 31, 2017, that is accounted for in accordance with the cost method of accounting. Please refer to Note 27—Variable interest entities for further details.

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32847-111569 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32787-111569 + Details
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