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Leases (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) Aircraft aircraft | Sep. 30, 2020 aircraft | Dec. 31, 2020 USD ($)
Leases [Abstract] |  |  |
Operating Leased Assets, Number of Units | Aircraft | 16 |  |
Finance Leased Assets, Number of Units | Aircraft | 12 |  |
Number Of Aircraft In Sale-Leaseback Transactions | aircraft | 3 | 7 |
operating right of use asset, net | $ 124,297 |  | $ 115,911
Finance Lease, Right-of-Use Asset, after Accumulated Amortization | 235,759 |  | 133,175
Total Right-of-Use Asset | 360,056 |  | 249,086
Current operating lease liabilities | 17,642 |  | 14,313
Finance Lease, Liability, Current | 14,951 |  | 9,767
Noncurrent operating lease liabilities | 110,322 |  | 102,289
Finance Lease, Liability, Noncurrent | 247,035 |  | 117,060
Total Lease Liability | 389,950 |  | $ 243,429
Sale Leaseback Transaction, Net Proceeds, Financing Activities | $ 105,000 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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