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Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Net Goodwill |  |  |
Beginning balance | $ 475,791,000 | $ 475,791,000 | $ 509,592,000
Additions through current year acquisitions |  | 6,680,000 |
Reductions from dispositions |  | (494,000) | (33,801,000)
Reductions from impairment | (268,000,000.0) | (268,000,000.0) |
Ending balance |  | 213,977,000 | 475,791,000
Net of accumulated impairment losses |  | 1,100,000,000 | 796,700,000
Net of accumulated impairment losses |  | 1,100,000,000 | 796,700,000
Franchise assets |  |  |
Franchise Assets |  |  |
Beginning balance | $ 64,300,000 | 64,300,000 | 65,700,000
Additions through current year acquisitions |  | 0 |
Reductions from dispositions |  | 0 | (1,400,000)
Reductions from impairment |  | 0 |
Ending balance |  | 64,300,000 | $ 64,300,000
Continuing operations | Franchise assets |  |  |
Franchise Assets |  |  |
Reductions from impairment |  | $ 0 |

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