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Flight equipment held for operating leases, net | 12 Months Ended
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Dec. 31, 2017
Property Subject to or Available for Operating Lease, Net [Abstract] |
Flight equipment held for operating leases, net | Flight equipment held for operating leases, net Movements in flight equipment held for operating leases during the years ended December 31, 2017 and 2016 were as follows:
| Year Ended December 31,
| 2017 |  | 2016
Net book value at beginning of period | $ | 31,501,973 |  |  | $ | 32,219,494 |
Additions | 5,276,715 |  |  | 3,863,905 |
Depreciation | (1,690,753 | ) |  | (1,753,574 | )
Impairment (Note 24) | (54,331 | ) |  | (78,335 | )
AeroTurbine restructuring (Note 25) | (2,662 | ) |  | (15,392 | )
Disposals and transfers (to) from held for sale | (2,281,401 | ) |  | (2,222,432 | )
Transfers (to) from net investment in finance and sales-type leases/inventory | (352,714 | ) |  | (511,693 | )
Net book value at end of period | $ | 32,396,827 |  |  | $ | 31,501,973 |
Accumulated depreciation as of December 31, 2017 and 2016, respectively | $ | (6,067,084 | ) |  | $ | (5,086,611 | )

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- Definition The entire disclosure for operating leases of a lessor. This may include a general description of lessor's leasing arrangements for operating leases, including the basis on which contingent rental payments are determined, the existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41457-112716 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6453916&loc=d3e41460-112716 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37051-112695 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37045-112695 + Details
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- References No definition available. + Details
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