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GOODWILL AND INTANGIBLE ASSETS - Customer Relationships (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
International |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | $ 4,700 |  |
Customer relationships |  |  |
Finite-lived intangible assets |  |  |
Amortization | 3,200 | $ 2,000 | $ 400
Customer relationships | International |  |  |
Future Amortization |  |  |
2018 | 2,411 |  |
2019 | 1,897 |  |
2020 | 1,528 |  |
2021 | 1,300 |  |
2022 | 1,143 |  |
Thereafter | 3,455 |  |
Total | 11,734 |  |
Franchise Rights | International |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | 3,000 |  |
Trade names | International |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | $ 1,700 |  |
Impairment of other intangibles |  | $ 300 |

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