Summary of Significant Accounting Policies -Revenue Recognition, Player Loyalty Programs, and Gaming and Racing Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue Recognition and Promotional Allowances
Promotional allowances	$ 183,496	$ 174,661	$ 154,987
Cost of complimentary services	$ 60,723	57,306	51,793
Player Loyalty Programs
Marquee Rewards points expired after inactivity (in months)	6 months
Player loyalty liability recorded within accrued expenses on the consolidated balance sheets	$ 13,000	14,200
Gaming and Racing Taxes
Gaming expense	983,300	962,700	921,600
Rooms
Revenue Recognition and Promotional Allowances
Promotional allowances	41,213	39,352	34,708
Cost of complimentary services	5,826	5,291	4,199
Food And Beverage
Revenue Recognition and Promotional Allowances
Promotional allowances	133,104	126,438	111,144
Cost of complimentary services	51,460	48,497	44,012
Other
Revenue Recognition and Promotional Allowances
Promotional allowances	9,179	8,871	9,135
Cost of complimentary services	$ 3,437	$ 3,518	$ 3,582