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Estimated Cost of Providing Promotional Allowances (Details) - Gaming expenses [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Promotional Allowances [Line Items]      
Estimated cost of promotional allowances $ 22,871 $ 16,386 $ 3,076
Food and Beverage [Member]      
Promotional Allowances [Line Items]      
Estimated cost of promotional allowances 21,007 15,201 2,263
Rooms [Member]      
Promotional Allowances [Line Items]      
Estimated cost of promotional allowances 1,451 818 608
Other [Member]      
Promotional Allowances [Line Items]      
Estimated cost of promotional allowances $ 413 $ 367 $ 205