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Nature of Operations and Summary of Significant Accounting Policies - Property and Equipment (Details) | 12 Months Ended
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Dec. 31, 2018
Aircraft, rotable spares, and spare engines | Maximum |
Property and Equipment |
Depreciable Life | 22 years
Residual Value (as a percent) | 20.00%
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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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