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Long-term Debt (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Current portion long-term debt | $ 361,131 | $ 313,243 |
Less current portion of unamortized debt issue cost, net | (3,804) | (3,565) |
Current portion of long-term debt, net of debt issue costs | 357,327 | 309,678 | [1]
Long-term debt, net of current maturities | 2,773,637 | 2,399,107 |
Less long-term portion of unamortized debt issue cost, net | (21,915) | (21,761) |
Long-term debt, net of current maturities and debt issue costs | 2,751,722 | 2,377,346 | [1]
Total long-term debt (including current portion) | 3,134,768 | 2,712,350 |
Total unamortized debt issue cost, net | (25,719) | (25,326) |
Total | 3,109,049 | 2,687,024 |
Debt issued to purchase of aircraft | 626,200 |  |
Letter of credit |  |  |
Debt Instrument [Line Items] |  |  |
Amount outstanding | $ 84,800 | $ 87,400 |
E 175 |  |  |
Debt Instrument [Line Items] |  |  |
Number of aircraft delivered | aircraft | 31 |  |
Debt instrument, term | 12 years |  |
Purchased, previously-leased aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Number of aircraft purchased | aircraft | 9 |  |
Interest rate (as a percent) | 6.45% |  |
Minimum | E 175 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 4.60% |  |
Minimum | Purchased, previously-leased aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, term | 3 years |  |
Maximum | E 175 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 5.00% |  |
Maximum | Purchased, previously-leased aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, term | 4 years |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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- 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 Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as noncurrent. 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 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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