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Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Goodwill |  |  |
Beginning balance | $ 525,780,000 | $ 472,437,000 |
Additions through current year acquisitions | 0 |  |
Prior year acquisition allocations | 0 | 59,980,000 |
Reductions from dispositions | (16,188,000) | (5,737,000) |
Reductions from impairment | 0 | (900,000) |
Ending balance | 509,592,000 | 525,780,000 |
Net of accumulated impairment losses | 797,600,000 | 797,600,000 | $ 796,700,000
Franchise assets |  |  |
Franchise Assets |  |  |
Beginning balance | 69,900,000 | 74,900,000 |
Additions through current year acquisitions | 0 |  |
Prior year acquisition allocations | 0 |  |
Reductions from dispositions | (2,100,000) | (1,400,000) |
Reductions from impairment | (2,100,000) | (3,600,000) |
Ending balance | 65,700,000 | 69,900,000 |
Continuing operations | Franchise assets |  |  |
Franchise Assets |  |  |
Reductions from impairment | $ (2,100,000) | $ (3,600,000) |

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