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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowances [Line Items]      
Promotional allowances $ 235,577 $ 242,645 $ 240,537
Cost of promotional allowances 176,872 181,612 186,284
Rooms      
Allowances [Line Items]      
Promotional allowances 74,937 77,177 77,751
Cost of promotional allowances 33,514 35,605 36,837
Food and Beverage      
Allowances [Line Items]      
Promotional allowances 146,946 150,598 151,677
Cost of promotional allowances 130,941 133,717 138,040
Other Products and Services      
Allowances [Line Items]      
Promotional allowances 13,694 14,870 11,109
Cost of promotional allowances $ 12,417 $ 12,290 $ 11,407