Summary of Significant Accounting Policies - Revenue Recognition, Promotional Allowances, and Gaming and Racing Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue recognition
Promotional allowances	$ 44,113	$ 38,200	$ 84,684	$ 76,088
Cost of complimentary services	14,454	12,504	27,919	25,106
Gaming and Racing Taxes
Gaming expense	259,500	244,500	515,900	471,500
Rooms
Revenue recognition
Promotional allowances	10,098	8,903	19,220	17,239
Cost of complimentary services	1,349	974	2,546	1,909
Food and beverage
Revenue recognition
Promotional allowances	31,796	27,215	61,318	54,651
Cost of complimentary services	12,194	10,657	23,718	21,486
Other
Revenue recognition
Promotional allowances	2,219	2,082	4,146	4,198
Cost of complimentary services	$ 911	$ 873	$ 1,655	$ 1,711