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Acquisition of businesses - Schedule of Non-Significant Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Goodwill | $ 5,601 | $ 6,783 |
Net cash paid at acquisition date | 3,833 | 2,658 | $ 0
Franchised Restaurants |  |  |
Business Acquisition [Line Items] |  |  |
Property and equipment | 16,756 | 1,471 | 413
Identifiable intangible assets | 4,922 | 1,347 | 56
Goodwill | 1,224 | 1,589 | 0
Assumed debt | 0 | (77) | 0
Gain on purchase of franchised restaurants | (1,708) | (767) | 0
Purchase price | 21,194 | 3,563 | 469
Seller financing | (1,000) | 0 | 0
Settlement of franchise receivables | (16,361) | (905) | (469)
Net cash paid at acquisition date | 3,833 | $ 2,658 | $ 0
Puerto Rican Franchisees |  |  |
Business Acquisition [Line Items] |  |  |
Property and equipment | $ 14,290 |  |

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