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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowances [Line Items]      
Promotional allowances $ 242,645 $ 240,537 $ 243,657
Cost of promotional allowances 181,612 186,284 191,130
Rooms      
Allowances [Line Items]      
Promotional allowances 77,177 77,751 75,673
Cost of promotional allowances 35,605 36,837 37,520
Food and Beverage      
Allowances [Line Items]      
Promotional allowances 150,598 151,677 155,530
Cost of promotional allowances 133,717 138,040 141,915
Other Products and Services      
Allowances [Line Items]      
Promotional allowances 14,870 11,109 12,454
Cost of promotional allowances $ 12,290 $ 11,407 $ 11,695