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Long-term Debt (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) aircraft | Dec. 31, 2015 USD ($)
Long-term Debt |  |
Total long-term debt | $ 2,570,904 | $ 1,948,803
Less current maturities | (308,945) | (272,027)
Long-term debt, net of current maturities | $ 2,261,959 | $ 1,676,776
Effective interest rate (as a percent) | 3.80% | 3.70%
Aggregate amounts of principal maturities of long-term debt |  |
2017 | $ 308,945 |
2018 | 286,164 |
2019 | 286,266 |
2020 | 251,265 |
2021 | 236,896 |
Thereafter | 1,201,368 |
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 and surety bonds outstanding with various banks and surety institutions | $ 87,700 | 88,900
E 175 |  |
Long-term Debt |  |
Number of new aircraft acquired | aircraft | 41 |
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 2.64% to 2.82% through 2017 to 2020, secured by aircraft |  |
Long-term Debt |  |
Total long-term debt | $ 63,408 | 108,348
Notes payable to banks, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.64% to 2.82% through 2017 to 2020, secured by aircraft | Minimum |  |
Long-term Debt |  |
Interest rate (as a percent) | 2.64% |
Notes payable to banks, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.64% to 2.82% through 2017 to 2020, secured by aircraft | Maximum |  |
Long-term Debt |  |
Interest rate (as a percent) | 2.82% |
Notes payable to a financing company, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.27% to 3.25% through 2017 to 2021, secured by aircraft |  |
Long-term Debt |  |
Total long-term debt | $ 146,266 | 217,341
Notes payable to a financing company, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.27% to 3.25% through 2017 to 2021, secured by aircraft | Minimum |  |
Long-term Debt |  |
Interest rate (as a percent) | 2.27% |
Notes payable to a financing company, due in semi-annual installments, variable interest based on LIBOR, or with interest rates ranging from 2.27% to 3.25% through 2017 to 2021, secured by aircraft | Maximum |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
Total long-term debt | $ 86,052 | 108,069
Notes payable to banks, due in semi-annual installments plus interest at 6.06% to 6.51% through 2021, secured by aircraft | Minimum |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
Total long-term debt | $ 8,854 | 17,208
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 |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
Total long-term debt | $ 426,389 | 479,170
Notes payable to banks, due in monthly installments plus interest of 2.68% to 6.86% through 2025, secured by aircraft | Minimum |  |
Long-term Debt |  |
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 |  |
Long-term Debt |  |
Interest rate (as a percent) | 6.86% |
Notes payable to banks, due in monthly installments, plus interest at 6.05% through 2020, secured by aircraft |  |
Long-term Debt |  |
Interest rate (as a percent) | 6.05% |
Total long-term debt | $ 8,998 | 11,304
Notes payable to banks, due in monthly installments, plus interest at 3.44% through 2019, secured by aircraft |  |
Long-term Debt |  |
Interest rate (as a percent) | 3.44% |
Total long-term debt | $ 3,280 | 4,615
Notes payable to banks, due in quarterly installments plus interest at 3.39% to 4.68% through 2028, secured by aircraft |  |
Long-term Debt |  |
Total long-term debt | $ 1,806,981 | 966,156
Notes payable to banks, due in quarterly installments plus interest at 3.39% to 4.68% through 2028, secured by aircraft | Minimum |  |
Long-term Debt |  |
Interest rate (as a percent) | 3.39% |
Notes payable to banks, due in quarterly installments plus interest at 3.39% to 4.68% through 2028, secured by aircraft | Maximum |  |
Long-term Debt |  |
Interest rate (as a percent) | 4.68% |
Notes payable to banks, due in monthly installments, plus interest based on LIBOR at 3.54% through 2017, secured by aircraft |  |
Long-term Debt |  |
Interest rate (as a percent) | 3.54% |
Total long-term debt | $ 4,666 | 14,538
Notes payable to banks due in monthly installments, interest based on LIBOR interest at 3.30% through 2019, secured by spare engines |  |
Long-term Debt |  |
Interest rate (as a percent) | 3.30% |
Total long-term debt | $ 16,010 | 22,054
Line of credit |  |
Long-term Debt |  |
Effective interest rate (as a percent) | 3.30% |
Aggregate amounts of principal maturities of long-term debt |  |
Maximum borrowing capacity | $ 75,000 | $ 25,000
Amount outstanding | 0 |
Letters of credit | 6,500 |
Current borrowing capacity | $ 68,500 |
LIBOR | Line of credit |  |
Long-term Debt |  |
Basis spread on variable rate | 2.50% |

X
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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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + 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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