REVENUE AND CONTRACT ASSETS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Franchise fees and other taxes and fees	$ 63,830	$ 64,986
Minimum
Disaggregation of Revenue [Line Items]
Contract term	3 years
Maximum
Disaggregation of Revenue [Line Items]
Contract term	5 years