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Summary of Significant Accounting Policies (Promotional Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowances [Line Items]      
Promotional allowances   $ 0 $ 0
Food and Beverage      
Allowances [Line Items]      
Promotional allowances $ 182,960 171,904 147,494
Rooms [Member]      
Allowances [Line Items]      
Promotional allowances 81,671 76,565 75,647
Other Products and Services      
Allowances [Line Items]      
Promotional allowances $ 11,939 $ 10,900 $ 11,076