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Subsequent Events Subsequent Events (Details) (USD $)
1 Months Ended
Aug. 31, 2013
Senior Notes Due 2021
Subsequent Event
Aug. 05, 2013
Senior Notes Due 2021
Subsequent Event
Jun. 30, 2013
Ameristar
Aug. 07, 2013
Ameristar
Subsequent Event
Jun. 30, 2013
Ameristar
Senior Notes Due 2021
Subsequent Event [Line Items]          
Business Acquisition, Credit on Project Costs       $ 37,000,000  
Debt Instrument, Face Amount   850,000,000 1,000    
Debt Instrument, Interest Rate, Stated Percentage   6.38%     7.50%
Proceeds from Issuance of Senior Long-term Debt $ 835,000,000