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Unaudited Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
End of Lease (“EOL”) and Maintenance Reserved (“MR”) contract maintenance rights expense |  | $ 6,170 | $ 28,078
MR contract maintenance rights write-off due to maintenance liability release |  | 7,340 | 1,841
EOL contract maintenance rights write-off due to cash receipt |  | 16,701 | 35,346
Maintenance rights write-off | [1] | 30,211 | 65,265
Non-Cash Investing And Financing Activities |  |  |
Flight equipment reclassified to net investment in finance and sales-type leases |  | 19,900 | 38,700
Flight equipment reclassified to held for sale, net |  | 84,700 | 83,500
Accrued maintenance liability settled with buyers upon sale or disposal of assets |  | $ 13,587 | 86,592
Non-Cash Investing And Financing Activities | Norwegian Air Shuttle ASA |  |  |
Other assets and Accounts payable, accrued expenses and other liabilities increase due to NAS recapitalization |  |  | $ 185,700
[1] | Maintenance rights write-off consisted of the following:
End of Lease (“EOL”) and Maintenance Reserved (“MR”) contract maintenance rights expense | $ | 6,170 |  |  | $ | 28,078 |
MR contract maintenance rights write-off due to maintenance liability release | 7,340 |  |  | 1,841 |
EOL contract maintenance rights write-off due to cash receipt | 16,701 |  |  | 35,346 |
Maintenance rights write-off | $ | 30,211 |  |  | $ | 65,265 |

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- Definition Accrued Maintenance Liability, Release To Income Upon Sale + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the aggregate expense charged against earnings to allocate the maintenance rights expense related to a limited duration contract for service and contractual agreement that stipulates the lessee pay the lessor for use of an asset. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total of the amount of flight equipment under operating leases reclassified to net investment in finance and sale-type leases and any amount charged to expense (recognized in income). + References No definition available. + Details
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- Definition Amount Of Flight Equipment Under Operating Leases Transferred To Flight Equipment Held For Sale + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maintenance Rights Intangible, End Of Lease Contract Cash Receipt + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maintenance Rights Intangible, End Of Lease Contract Maintenance Rights Expense + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maintenance Rights Intangible, Maintenance Reserved Contract Rights Expense Offset By Maintenance Liability Release + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other Assets and Accounts Payable, Accrued Expenses and Other Liabilities Increase Due To Recapitalization + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
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