SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances, Advertising Costs and Gaming Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Promotional Allowances
Estimated departmental costs of providing promotional allowances	$ 44,925	$ 41,808	$ 43,168
Advertising Costs
Advertising expense	5,200	5,200	5,200
Gaming Taxes
Total gaming taxes	18,200	16,000	16,100
Food and beverage
Promotional Allowances
Estimated departmental costs of providing promotional allowances	23,761	22,855	21,713
Hotel
Promotional Allowances
Estimated departmental costs of providing promotional allowances	3,157	2,893	2,622
Other
Promotional Allowances
Estimated departmental costs of providing promotional allowances	2,070	1,732	1,777
Promotional allowances
Promotional Allowances
Estimated departmental costs of providing promotional allowances	$ 28,988	$ 27,480	$ 26,112