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Nature of Operations and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Property and Equipment |  |
Increased depreciation expense | $ 1.4 |
New aircraft |  |
Property and Equipment |  |
Depreciable Life |  | 18 years
Residual Value (as a percent) |  | 30.00%
New aircraft | Minimum |  |
Property and Equipment |  |
Depreciable Life | 20 years |
Residual Value (as a percent) | 17.50% |
New aircraft | Maximum |  |
Property and Equipment |  |
Depreciable Life | 22 years |
Residual Value (as a percent) | 20.00% |
Used Aircraft, rotable spares, and spare engines | Minimum |  |
Property and Equipment |  |
Residual Value (as a percent) | 0.00% | 0.00%
Used Aircraft, rotable spares, and spare engines | Maximum |  |
Property and Equipment |  |
Depreciable Life | 18 years | 18 years
Residual Value (as a percent) | 20.00% | 30.00%
Ground equipment |  |
Property and Equipment |  |
Residual Value (as a percent) | 0.00% |
Ground equipment | Maximum |  |
Property and Equipment |  |
Depreciable Life | 10 years |
Office equipment |  |
Property and Equipment |  |
Residual Value (as a percent) | 0.00% |
Office equipment | Maximum |  |
Property and Equipment |  |
Depreciable Life | 7 years |
Leasehold improvements |  |
Property and Equipment |  |
Residual Value (as a percent) | 0.00% |
Leasehold improvements | Maximum |  |
Property and Equipment |  |
Depreciable Life | 15 years |
Buildings |  |
Property and Equipment |  |
Residual Value (as a percent) | 0.00% |
Buildings | Minimum |  |
Property and Equipment |  |
Depreciable Life | 20 years |
Buildings | Maximum |  |
Property and Equipment |  |
Depreciable Life | 39 years 6 months |

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- Definition Amount of increase (decrease) in accumulated depreciation, depletion and amortization of property, plant and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- References No definition available. + Details
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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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