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Lease (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease costs recognized on the statements of income were as follows:
|  | Year Ended December 31,
(in thousands) | Classification on the Statements of Income | 2020 |  | 2019
Finance lease costs: |  |  |  |
Amortization of assets | Depreciation and amortization | $ | 6,631 |  |  | $ | 6,517 |
Interest on lease liabilities | Interest expense | 5,335 |  |  | 5,264 |
Operating lease cost | Aircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense | 12,616 |  |  | 3,541 |
Variable lease cost | Station operations; Maintenance and repairs; Other operating expense | 3,560 |  |  | 2,274 |
Total lease cost |  | $ | 28,142 |  |  | $ | 17,596 |
Leases of Lessee Disclosure [Text Block] | The table below presents the lease-related assets and liabilities recorded on the balance sheet.
|  | As of December 31,
(in thousands) | Classification on the Balance Sheet | 2020 |  | 2019
Assets |  |  |  |
Operating lease assets | Operating lease right-of-use assets, net | $ | 115,911 |  |  | $ | 22,081 |
Finance lease assets | Property and equipment, net | 133,175 |  |  | 111,665 |
Total lease assets |  | $ | 249,086 |  |  | $ | 133,746 |
Liabilities |  |  |  |
Current |  |  |  |
Operating | Current operating lease liabilities | $ | 14,313 |  |  | $ | 2,662 |
Finance | Current maturities of long-term debt and finance lease obligations | 9,767 |  |  | 7,666 |
Noncurrent |  |  |  |
Operating | Noncurrent operating lease liabilities | 102,289 |  |  | 21,290 |
Finance | Long-term debt and finance lease obligations | 117,060 |  |  | 107,930 |
Total lease liabilities |  | $ | 243,429 |  |  | $ | 139,548 |
Weighted-average remaining lease term |  |  |  |
Operating leases |  | 8.3 years |  | 9.1 years
Finance leases |  | 7.6 years |  | 9.9 years
Weighted-average discount rate |  |  |  |
Operating leases |  | 5.4 | % |  | 4.3 | %
Finance leases |  | 5.0 | % |  | 4.4 | %
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | The table below presents supplemental cash flow information related to leases during the year ended December 31.
| Year Ended December 31,
(in thousands) | 2020 |  | 2019
Cash paid for amounts included in the measurement of lease liabilities |  |  |
Operating cash flows for operating leases | $ | 13,102 |  |  | $ | 2,927 |
Operating cash flows for finance leases | $ | 5,335 |  |  | 5,264 |
Financing cash flows for finance leases | 15,908 |  |  | 7,336 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | The table below indicates the future minimum payments of lease liabilities as of December 31, 2020.
(in thousands) | Operating Leases |  | Finance Leases
2021 | $ | 20,055 |  |  | $ | 15,871 |
2022 | 20,313 |  |  | 14,366 |
2023 | 20,160 |  |  | 26,045 |
2024 | 19,853 |  |  | 10,500 |
2025 | 17,723 |  |  | 10,500 |
Thereafter | 44,486 |  |  | 82,458 |
Total lease payments | 142,590 |  |  | 159,740 |
Less imputed interest | (25,988) |  |  | (32,913) |
Total lease obligations | 116,602 |  |  | 126,827 |
Less current obligations | (14,313) |  |  | (9,767) |
Long-term lease obligations | $ | 102,289 |  |  | $ | 117,060 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717 + Details
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