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Leases (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended
	Dec. 22, 2017	Mar. 31, 2010	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Lease term of aircraft operating lease agreement		8 years
Periodic payments for aircraft operating lease agreement		$ 690
Fixed amount of early purchase option		$ 26,685
Aircraft operating lease renewal term	10 years
Periodic payments for aircraft renewal operating lease agreement	$ 442
Collateral deposit for aircraft operating lease	$ 2,500
Finance lease obligations			$ 5,419
Finance lease obligations				$ 6,503
Arithmetic Average
Lessee, Lease, Description [Line Items]
Lease term for most restaurants			15 years

X

- Definition

Fixed amount of early purchase option

+ References

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- Definition

Lease Renewal Term Of Aircraft Operating Lease Agreement

+ References

No definition available.

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X

- Definition

Lease term of aircraft operating lease agreement

+ References

No definition available.

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- Definition

Lessee Leasing Arrangement, Operating Leases, Collateral Deposit

+ References

No definition available.

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- Definition

Lessee Leasing Arrangement, Operating Leases, Periodic Payment

+ References

No definition available.

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- Definition

Periodic payments for aircraft operating lease agreement

+ References

No definition available.

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X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-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 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981

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