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Marketable Securities, Eldorado Resorts, Inc. (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Mar. 29, 2016
Feb. 29, 2016
May 31, 2016
Sep. 19, 2014
Schedule of Equity Method Investments [Line Items]        
Realized gain on liquidated ownership of ERI $ 17.7 $ 2.2    
ERI        
Schedule of Equity Method Investments [Line Items]        
Common stock issued (shares)       4,030,440
Par value (usd per share)       $ 0.00001
Equity method investee percentage ownership in JV (percent)       8.60%
Eldorado        
Schedule of Equity Method Investments [Line Items]        
Common stock issued (shares)       4,030,400
Equity method investee percentage ownership in JV (percent)     17.0359%  
Equity interest sold, shares 4,030,440