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Summary of Significant Accounting Policies (Preopening Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Preopening Expenses [Line Items]      
Project development, preopening and writedowns $ 14,454 $ 22,107 $ 6,907