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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Allowances [Line Items]    
Promotional allowances $ 63,464 $ 60,314
Cost of promotional allowances 49,789 44,821
Rooms    
Allowances [Line Items]    
Promotional allowances 18,477 18,945
Cost of promotional allowances 8,359 8,569
Food and Beverage    
Allowances [Line Items]    
Promotional allowances 42,067 37,452
Cost of promotional allowances 37,622 33,271
Other Products and Services    
Allowances [Line Items]    
Promotional allowances 2,920 3,917
Cost of promotional allowances $ 3,808 $ 2,981