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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
Summary of significant accounting policies |  |  |
Revenues | $ 2,695,823,000 | $ 2,424,300,000 | $ 2,161,220,000
Goodwill impairment loss | 0 |  |
Impairment of intangible assets | $ 0 |  |
Time Lapse Restricted Shares |  |  |
Summary of significant accounting policies |  |  |
Award vesting period |  | 6 years |
UNITED STATES |  |  |
Summary of significant accounting policies |  |  |
Number of franchise agreements | item | 137 | 135 | 128
Revenues | $ 2,498,363,000 | $ 2,240,226,000 | $ 2,006,368,000
International |  |  |
Summary of significant accounting policies |  |  |
Number of franchise agreements | item | 89 | 103 | 101
Revenues | $ 197,460,000 | $ 184,074,000 | $ 154,852,000
Percent of total revenues | 7.00% | 8.00% | 7.00%
Cash held in FDIC | $ 26,700,000 |  |
Franchising revenue |  |  |
Summary of significant accounting policies |  |  |
Revenues | $ 15,500,000 | $ 15,500,000 | $ 15,200,000
Maximum | Time Lapse Restricted Shares |  |  |
Summary of significant accounting policies |  |  |
Award vesting period | 5 years | 6 years |
Maximum | Franchising revenue |  |  |
Summary of significant accounting policies |  |  |
Percent of total revenues | 1.00% | 1.00% | 1.00%
Maximum | Equipment rental |  |  |
Summary of significant accounting policies |  |  |
Percent of total revenues | 1.00% | 1.00% | 1.00%

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