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Fair Value Measurements - Nonrecurring Basis (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) engine | Dec. 31, 2020 USD ($) engine | Dec. 31, 2020 USD ($) engine aircraft. | Dec. 31, 2019 USD ($) engine
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment | $ 20,540 |  |  | $ 18,220
Net book value of equipment held for operating lease | 31,753 | $ 31,753 | $ 31,753 | 31,520
Equipment held for lease |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment | 4,900 |  |  | 6,400
Net book value of equipment held for operating lease | 1,886,613 | $ 1,886,613 | $ 1,886,613 | $ 1,650,918
Assets To Be Sold Or Parted Out |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment | 15,200 |  |  |
Number of assets impaired |  | 10 | 2 | 11
Assets To Be Sold Or Parted Out | Equipment held for lease |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Net book value of equipment held for operating lease | $ 37,600 | $ 37,600 | $ 37,600 |
Number of engines | engine | 21 | 21 | 21 |
Impaired Assets |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment | $ 5,300 |  |  |
Number of assets impaired | engine |  | 7 |  | 7
Nonrecurring |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Equipment held for lease | 20,470 |  |  | $ 18,132
Equipment held for sale | 70 |  |  | 88
Total | 20,540 |  |  | 18,220
Write-down of equipment | $ 20,500 |  |  | 18,200
Nonrecurring | Assets To Be Sold Or Parted Out |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment |  |  |  | 11,800
Nonrecurring | Impaired Assets |  |  |  |
Assets and (Liabilities) at Fair Value |  |  |  |
Write-down of equipment |  |  |  | $ 6,400

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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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