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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-Term Debt |
Schedule of long-term debt | Long‑term debt consisted of the following as of December 31, 2017 and 2016 (in thousands):
|  | December 31, |  | December 31, |
|  | 2017 |  | 2016 |
Notes payable to banks, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.91% to 3.43% through 2020, secured by aircraft |  | $ | 34,905 |  | $ | 63,408 |
Notes payable to a financing company, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.85% to 3.25% through 2021, secured by aircraft |  |  | 97,612 |  |  | 146,266 |
Notes payable to banks, due in semi-annual installments plus interest at 6.06% to 6.51% through 2021, secured by aircraft |  |  | 63,090 |  |  | 86,052 |
Notes payable to a financing company, due in semi-annual installments plus interest at 5.78% to 6.23% through 2017, secured by aircraft |  |  | — |  |  | 8,854 |
Notes payable to banks, due in monthly installments plus interest of 2.68% to 6.86% through 2025, secured by aircraft |  |  | 372,157 |  |  | 426,389 |
Notes payable to banks, due in monthly installments, plus interest at 4.16% to 6.05% through 2029, secured by aircraft |  |  | 49,001 |  |  | 8,998 |
Notes payable to banks, due in monthly installments, plus interest at 3.44% through 2019, secured by aircraft |  |  | — |  |  | 3,280 |
Notes payable to banks, due in quarterly installments, plus interest at 3.39% to 4.73% through 2029, secured by aircraft |  |  | 2,085,822 |  |  | 1,806,981 |
Notes payable to banks, due in monthly installments, plus interest based on LIBOR at 3.54% through 2017, secured by aircraft |  |  | — |  |  | 4,666 |
Notes payable to banks due in monthly installments, interest at 3.30% through 2019, secured by spare engines |  |  | 9,763 |  |  | 16,010 |
Long-term debt |  | $ | 2,712,350 |  | $ | 2,570,904 |
Current portion of long-term debt |  |  | (313,243) |  |  | (308,945) |
Less long-term portion of unamortized debt issue cost, net |  |  | (21,761) |  |  | (21,908) |
Long-term debt, net of current maturities and debt issue costs |  | $ | 2,377,346 |  | $ | 2,240,051 |
Current portion of long-term debt |  |  | 313,243 |  |  | 308,945 |
Less current portion of unamortized debt issue cost, net |  |  | (3,565) |  |  | (3,485) |
Current portion of long-term debt, net of debt issue costs |  | $ | 309,678 |  | $ | 305,460 |
Schedule of maturities of long-term debt | The aggregate amounts of principal maturities of long‑term debt as of December 31, 2017 were as follows (in thousands):
2018 |  | $ | 313,243 |
2019 |  |  | 315,753 |
2020 |  |  | 284,998 |
2021 |  |  | 272,470 |
2022 |  |  | 280,360 |
Thereafter |  |  | 1,245,526 |
|  | $ | 2,712,350 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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