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Operating lease agreements (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 USD ($) | Mar. 31, 2010 USD ($) | Dec. 31, 2018 location
Operating Leased Assets [Line Items] |  |  |
Number of locations the Company as lessee | location |  |  | 3,090
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 |  |
Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease term for most restaurants |  |  | 10 years
Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease term for most restaurants |  |  | 20 years

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- Definition Term of lessee's operating lease renewal, 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 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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