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