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Goodwill (Schedule of Goodwill By Segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 27, 2016
Dec. 31, 2014
Goodwill [Line Items]          
Goodwill, net $ 888,224 $ 826,476 $ 685,310   $ 685,310
Gross carrying value 1,072,299        
Cumulative amortization (6,134)        
Goodwill, Impairment Loss 0 12,462 $ 0    
Goodwill, Impaired, Accumulated Impairment Loss 177,941        
Las Vegas Locals          
Goodwill [Line Items]          
Goodwill, net 428,088        
Gross carrying value 593,567        
Cumulative amortization 0        
Goodwill, Impaired, Accumulated Impairment Loss 165,479        
Downtown Las Vegas          
Goodwill [Line Items]          
Goodwill, net 863        
Gross carrying value 6,997        
Cumulative amortization (6,134)        
Goodwill, Impaired, Accumulated Impairment Loss 0        
Midwest and South          
Goodwill [Line Items]          
Goodwill, Impairment Loss   12,500      
Peninsula          
Goodwill [Line Items]          
Goodwill, net 459,273        
Gross carrying value 471,735        
Cumulative amortization 0        
Goodwill, Impaired, Accumulated Impairment Loss 12,462        
Subsidiaries [Member]          
Goodwill [Line Items]          
Goodwill, net $ 61,700 $ 153,600   $ 130,324