Minimum Aircraft Age Threshold For Performance Of Impairment Assessments

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Summary of significant accounting policies [Line Items]

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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Amount of lessee's right to use underlying asset under operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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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.

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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.

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Summary of significant accounting policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 segment	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Minimum aircraft age threshold for performance of impairment assessments	5 years
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Cumulative effect due to adoption of new accounting standard			$ 1,241
Flight Equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of asset, years	25 years
Percentage of estimates for residual values of original manufacture cost	15.00%
Accumulated retained earnings
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect due to adoption of new accounting standard			1,241
Accounting Standards Update 2016-16 \| Accumulated retained earnings
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect due to adoption of new accounting standard			$ 1,200
Subsequent Event \| Accounting Standards Update 2016-02
Summary Of Significant Accounting Policies [Line Items]
Operating lease right of use asset		$ 60,000
Operating lease liability		$ 60,000