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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowances [Line Items]      
Promotional allowances $ 259,370 $ 235,577 $ 242,645
Cost of promotional allowances 197,330 176,872 181,612
Rooms      
Allowances [Line Items]      
Promotional allowances 76,029 74,937 77,177
Cost of promotional allowances 33,584 33,514 35,605
Food and Beverage      
Allowances [Line Items]      
Promotional allowances 168,886 146,946 150,598
Cost of promotional allowances 150,431 130,941 133,717
Other Products and Services      
Allowances [Line Items]      
Promotional allowances 14,455 13,694 14,870
Cost of promotional allowances $ 13,315 $ 12,417 $ 12,290