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Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) aircraft engine
Long-term Purchase Commitment [Line Items]
Commitments To Purchase Engine | engine	4
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 126,141
Unrecorded Unconditional Purchase Obligation, Due within Two Years	37,900
Unrecorded Unconditional Purchase Obligation, Due within Three Years	21,000
Unrecorded Unconditional Purchase Obligation	$ 185,041
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Number Of Aircraft Committed To Purchase | aircraft	8

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Commitments To Purchase Engine

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Number Of Aircraft Committed To Purchase

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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