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Long-term Debt (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) aircraft | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |
Total 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 |
Effective interest rate (as a percent) | 3.90% | 3.80% |
Aggregate amounts of principal maturities of long-term debt |  |  |
2018 | $ 313,243 |  |
2019 | 315,753 |  |
2020 | 284,998 |  |
2021 | 272,470 |  |
2022 | 280,360 |  |
Thereafter | 1,245,526 |  |
Repayment of debt in cash |  | $ 16,500 | $ 110,800
Total repayment of debt |  | 18,400 | 145,400
Pre-tax gain |  | 1,279 | $ 33,660
Letters of credit | 14,800 | 6,500 |
Current borrowing capacity | 60,200 | 68,500 |
Letters of credit and surety bonds outstanding with various banks and surety institutions | $ 87,400 | 87,700 |
E 175 |  |  |
Debt Instrument [Line Items] |  |  |
Number of new aircraft acquired | aircraft | 21 |  |
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 interest rates ranging from 2.91% to 3.43% through 2020, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 34,905 | 63,408 |
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 | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 2.91% |  |
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 | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.43% |  |
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 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 97,612 | 146,266 |
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 | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 2.85% |  |
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 | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.25% |  |
Notes payable to banks, due in semi-annual installments plus interest at 6.06% to 6.51% through 2021, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 63,090 | 86,052 |
Notes payable to banks, due in semi-annual installments plus interest at 6.06% to 6.51% through 2021, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.06% |  |
Notes payable to banks, due in semi-annual installments plus interest at 6.06% to 6.51% through 2021, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.51% |  |
Notes payable to a financing company, due in semi-annual installments plus interest at 5.78% to 6.23% through 2017, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | 8,854 |
Notes payable to a financing company, due in semi-annual installments plus interest at 5.78% to 6.23% through 2017, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 5.78% |  |
Notes payable to a financing company, due in semi-annual installments plus interest at 5.78% to 6.23% through 2017, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 6.23% |  |
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 | $ 372,157 | 426,389 |
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 4.16% to 6.05% through 2029, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 49,001 | 8,998 |
Notes payable to banks, due in monthly installments, plus interest at 4.16% to 6.05% through 2029, secured by aircraft | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 4.16% |  |
Notes payable to banks, due in monthly installments, plus interest at 4.16% 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 monthly installments, plus interest at 3.44% through 2019, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.44% |  |
Total long-term debt |  | 3,280 |
Notes payable to banks, due in quarterly installments plus interest at 3.39% to 4.73% through 2029, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 2,085,822 | 1,806,981 |
Notes payable to banks, due in quarterly installments plus interest at 3.39% to 4.73% through 2029, 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 4.73% through 2029, secured by aircraft | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 4.73% |  |
Notes payable to banks, due in monthly installments, plus interest based on LIBOR at 3.54% through 2017, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 3.54% |  |
Total long-term debt |  | 4,666 |
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 | $ 9,763 | 16,010 |
Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rate (as a percent) | 4.10% |  |
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
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit and surety bonds outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.8) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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