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REVENUE AND CONTRACT ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Franchise fees and other taxes and fees | $ 63,362 | $ 64,804 | $ 127,192 | $ 129,790
Minimum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract term |  |  | 3 years |
Maximum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract term |  |  | 5 years |

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