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Maintenance rights intangible and lease premium, net | 12 Months Ended
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Dec. 31, 2017
Maintenance Rights Intangible And Lease Premium, Net [Abstract] |
Maintenance rights intangible and lease premium, net | Maintenance rights intangible and lease premium, net Maintenance rights intangible and lease premium consisted of the following as of December 31, 2017 and 2016:
| As of December 31,
| 2017 |  | 2016
Maintenance rights intangible | $ | 1,464,599 |  |  | $ | 2,117,034 |
Lease premium, net | 37,259 |  |  | 50,891 |
| $ | 1,501,858 |  |  | $ | 2,167,925 |
Movements in maintenance rights intangible during the years ended December 31, 2017 and 2016 were as follows:
| Year Ended December 31,
| 2017 |  | 2016
Maintenance rights intangible at beginning of period | $ | 2,117,034 |  |  | $ | 3,068,318 |
EOL and MR contract maintenance rights expense | (355,845 | ) |  | (381,637 | )
MR contract maintenance rights write-off due to maintenance liability release | (77,494 | ) |  | (173,971 | )
EOL contract maintenance rights write-off due to cash receipt | (106,433 | ) |  | (96,503 | )
EOL and MR contract intangible write-off due to sale of aircraft | (112,663 | ) |  | (284,411 | )
Transfer to other assets | — |  |  | (17,162 | )
Additions due to aircraft acquisitions | — |  |  | 2,400 |
Maintenance rights intangible at end of period | $ | 1,464,599 |  |  | $ | 2,117,034 |
The following tables present details of lease premium and related accumulated amortization as of December 31, 2017 and 2016:
| As of December 31, 2017
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Lease premium | $ | 77,977 |  |  | $ | (40,718 | ) |  | $ | 37,259 |
| As of December 31, 2016
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Lease premium | $ | 94,959 |  |  | $ | (44,068 | ) |  | $ | 50,891 |
Lease premiums that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above. During the years ended December 31, 2017, 2016 and 2015, we recorded amortization expense for lease premium of $13.6 million, $19.8 million and $23.0 million, respectively. As of December 31, 2017, the estimated future amortization expense for lease premium was as follows:
| Estimated amortization expense
2018 | $ | 11,219 |
2019 | 10,466 |
2020 | 7,727 |
2021 | 5,394 |
2022 | 914 |
Thereafter | 1,539 |
| $ | 37,259 |

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- Definition Maintenance Rights Intangible And Lease Premium [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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