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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Allowances [Line Items]        
Promotional allowances $ 64,715 $ 57,010 $ 128,179 $ 117,324
Cost of promotional allowances 48,042 41,763 97,831 86,584
Rooms        
Allowances [Line Items]        
Promotional allowances 18,879 18,294 37,356 37,239
Cost of promotional allowances 8,128 7,921 16,487 16,490
Food and Beverage        
Allowances [Line Items]        
Promotional allowances 42,087 35,660 84,154 73,112
Cost of promotional allowances 37,266 30,842 74,888 64,113
Other Products and Services        
Allowances [Line Items]        
Promotional allowances 3,749 3,056 6,669 6,973
Cost of promotional allowances $ 2,648 $ 3,000 $ 6,456 $ 5,981