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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Allowances [Line Items]        
Promotional allowances $ 65,059 $ 58,488 $ 193,238 $ 175,812
Cost of promotional allowances 49,530 43,959 147,361 130,542
Rooms        
Allowances [Line Items]        
Promotional allowances 19,394 18,778 56,750 56,017
Cost of promotional allowances 8,508 8,307 24,995 24,797
Food and Beverage        
Allowances [Line Items]        
Promotional allowances 41,768 36,528 125,922 109,640
Cost of promotional allowances 37,651 32,611 112,539 96,724
Other Products and Services        
Allowances [Line Items]        
Promotional allowances 3,897 3,182 10,566 10,155
Cost of promotional allowances $ 3,371 $ 3,041 $ 9,827 $ 9,021