LONG-TERM LEASE OBLIGATIONS - Components of Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Company-owned and franchise stores:
Rent on operating leases	$ 193,398	$ 193,830	$ 187,346
Landlord related taxes	27,872	27,747	25,765
Common operating expenses	45,866	45,375	44,184
Percent and contingent rent	17,870	19,435	21,109
Total company-owned and franchise stores	285,006	286,387	278,404
Other	22,446	19,905	16,568
Total rent expense	$ 307,452	$ 306,292	$ 294,972