SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances, Advertising Costs and Gaming Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Promotional Allowances
Estimated departmental costs of providing promotional allowances	$ 47,112	$ 44,925	$ 41,808
Advertising Costs
Advertising expense	5,400	5,200	5,200
Gaming Taxes
Total gaming taxes	20,300	18,200	16,100
Food and beverage
Promotional Allowances
Estimated departmental costs of providing promotional allowances	25,743	23,761	22,855
Hotel
Promotional Allowances
Estimated departmental costs of providing promotional allowances	3,039	3,157	2,893
Other
Promotional Allowances
Estimated departmental costs of providing promotional allowances	1,943	2,070	1,732
Promotional allowances
Promotional Allowances
Estimated departmental costs of providing promotional allowances	$ 30,725	$ 28,988	$ 27,480