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Long-term Debt (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 3,185,438 | $ 2,712,350 |
Current portion of long-term debt | (354,072) | (313,243) |
Less long-term portion of unamortized debt issue cost, net | (21,598) | (21,761) |
Long-term debt, net of current maturities and debt issue costs | 2,809,768 | 2,377,346 |
Current portion of long-term debt | 354,072 | 313,243 |
Long-term debt, net of current maturities | 354,072 | 313,243 |
Less current portion of unamortized debt issue cost, net | (3,866) | (3,565) |
Current portion of long-term debt, net of debt issue costs | $ 350,206 | $ 309,678 |
Effective interest rate (as a percent) | 4.20% | 3.90% |
Aggregate amounts of principal maturities of long-term debt |  |  |
2019 | $ 354,072 |  |
2020 | 351,738 |  |
2021 | 347,835 |  |
2022 | 353,935 |  |
2023 | 359,677 |  |
Thereafter | 1,418,181 |  |
Repayment of debt in cash | 43,500 | $ 16,500 |
Total repayment of debt | 43,500 | 18,400 |
Pre-tax gain |  |  | $ 1,279
Letters of credit | 9,700 | 14,800 |
Current borrowing capacity | 65,300 | 60,200 |
Letters of credit and surety bonds outstanding with various banks and surety institutions | $ 78,700 | 87,400 |
E 175 |  |  |
Debt Instrument [Line Items] |  |  |
Number of new aircraft acquired | aircraft | 39 |  |
Purchase price portion financed through debt issuance (as a percent) | 85.00% |  |
Purchase price portion paid with cash (as a percent) | 15.00% |  |
Notes payable to banks, due in semi-annual installments, variable interest based on LIBOR, or with an interest rate of 4.00% through 2019, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 4.00% |  |
Total long-term debt | $ 6,429 | 34,905 |
Notes payable to a financing company, due in semi-annual installments, variable interest based on LIBOR, or with an interest rate of 3.25% through 2021, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.25% |  |
Total long-term debt | $ 36,324 | 97,612 |
Notes payable to banks, due in semi-annual installments plus interest at 6.10% to 6.51% through 2021, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 41,592 | 63,090 |
Notes payable to banks, due in semi-annual installments plus interest at 6.10% to 6.51% through 2021, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.10% |  |
Notes payable to banks, due in semi-annual installments plus interest at 6.10% to 6.51% through 2021, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.51% |  |
Notes payable to banks, due in monthly installments plus interest of 2.68% to 6.86% through 2025, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 371,300 | 372,157 |
Notes payable to banks, due in monthly installments plus interest of 2.68% to 6.86% through 2025, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 2.68% |  |
Notes payable to banks, due in monthly installments plus interest of 2.68% to 6.86% through 2025, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.86% |  |
Notes payable to banks, due in monthly installments, plus interest at 4.07% to 6.05% through 2029, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 105,069 | 49,001 |
Notes payable to banks, due in monthly installments, plus interest at 4.07% to 6.05% through 2029, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 4.07% |  |
Notes payable to banks, due in monthly installments, plus interest at 4.07% to 6.05% through 2029, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.05% |  |
Notes payable to banks, due in quarterly installments, plus interest at 3.39% to 5.08% through 2030, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 2,621,416 | 2,085,822 |
Notes payable to banks, due in quarterly installments, plus interest at 3.39% to 5.08% through 2030, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.39% |  |
Notes payable to banks, due in quarterly installments, plus interest at 3.39% to 5.08% through 2030, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 5.08% |  |
Notes payable to banks due in monthly installments, interest based on LIBOR interest at 3.30% through 2019, secured by spare engines |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.30% |  |
Total long-term debt | $ 3,308 | 9,763 |
Line of credit |  |  |
Aggregate amounts of principal maturities of long-term debt |  |  |
Maximum borrowing capacity | 75,000 | 75,000 |
Amount outstanding | $ 0 | $ 0 |
LIBOR | Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.50% |  |

X
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