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Franchise arrangements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Franchise Arrangements [Line Items] |  |
Property and equipment, net | $ 743,533 | $ 796,532
Property and Equipment Under Franchise Arrangements |  |
Franchise Arrangements [Line Items] |  |
Property and equipment, net | 88,568 | 92,354
Land | $ 22,784 | $ 24,661
Initial Franchise Fee |  |
Franchise Arrangements [Line Items] |  |
Finite-lived intangible asset, useful life | 20 years |

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- Definition Amount before accumulated depletion of real estate held for productive use, excluding land held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6812-107765 + Details
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