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Intangible Franchise Rights and Goodwill (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | $ 8,755,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |
Intangible Franchise Rights, Beginning Balance |  | 285,632,000 |  |
Currency Translation |  | 1,239,000 |  |
Intangible Franchise Rights, Ending Balance |  | 295,626,000 |  |
Asset Impairment Charges |  | 0 |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance |  | 913,034,000 |  |
Goodwill, Acquired During Period |  | 44,129,000 |  |
Goodwill, Purchase Accounting Adjustments |  | 18,000 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  | 2,929,000 |  |
Goodwill, Ending Balance | [1] | 960,110,000 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | $ 97,800,000 | $ 97,800,000
BRAZIL |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | 0 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |
Intangible Franchise Rights, Beginning Balance |  | 168,000 |  |
Currency Translation |  | 1,000 |  |
Intangible Franchise Rights, Ending Balance |  | 169,000 |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 12,733,000 |  |
Goodwill, Acquired During Period |  | 0 |  |
Goodwill, Purchase Accounting Adjustments |  | 0 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  | 28,000 |  |
Goodwill, Ending Balance | [1] | 12,761,000 |  |
UNITED KINGDOM |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | 7,454,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |
Intangible Franchise Rights, Beginning Balance |  | 29,483,000 |  |
Currency Translation |  | 1,238,000 |  |
Intangible Franchise Rights, Ending Balance |  | 38,175,000 |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 65,034,000 |  |
Goodwill, Acquired During Period |  | 29,930,000 |  |
Goodwill, Purchase Accounting Adjustments |  | 0 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  | 2,901,000 |  |
Goodwill, Ending Balance | [1] | 97,865,000 |  |
UNITED STATES |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  | 1,301,000 |  |
Intangible Franchise Rights [Roll Forward] |  |  |  |
Intangible Franchise Rights, Beginning Balance |  | 255,981,000 |  |
Currency Translation |  | 0 |  |
Intangible Franchise Rights, Ending Balance |  | 257,282,000 |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance | [1] | 835,267,000 |  |
Goodwill, Acquired During Period |  | 14,199,000 |  |
Goodwill, Purchase Accounting Adjustments |  | 18,000 |  |
Goodwill, Foreign Currency Translation Gain (Loss) |  | 0 |  |
Goodwill, Ending Balance | [1] | $ 849,484,000 |  |
[1] | (1) Net of accumulated impairment of $97.8 million

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