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Long-Term and Other Debt - Notes (Details) - USD ($)
12 Months Ended
Nov. 21, 2014
Jun. 04, 2014
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument        
Debt discount capitalized     $ 26,300,000 $ 31,300,000
Senior subordinated notes due in 2021        
Debt Instrument        
Debt discount capitalized     $ 2,400,000  
Senior subordinated notes | Senior subordinated notes, due in 2018        
Debt Instrument        
Debt Instrument, interest rate, stated percentage     8.125%  
Debt discount capitalized     $ 0 0
Senior subordinated notes | Senior subordinated notes, due in 2018 | Redemption period two        
Debt Instrument        
Redemption price percentage     101.00%  
Senior subordinated notes | Senior subordinated notes, due in 2018 | Redemption period three        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Senior subordinated notes due 2020        
Debt Instrument        
Debt Instrument, interest rate, stated percentage     6.25%  
Debt discount capitalized     $ 0 0
Senior subordinated notes | Senior subordinated notes due 2020 | Redemption period two        
Debt Instrument        
Redemption price percentage     101.00%  
Senior subordinated notes | Senior subordinated notes due 2020 | Redemption period three        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Senior subordinated notes due in 2021        
Debt Instrument        
Debt Instrument, interest rate, stated percentage     6.625%  
Debt discount recorded     $ 9,700,000  
Debt amount   $ 350,000,000.0    
Debt instrument price percentage of principal amount   99.321%    
Capitalized costs during period   $ 7,300,000    
Debt discount capitalized     $ 1,800,000 2,200,000
Senior subordinated notes | Senior subordinated notes due in 2021 | Redemption period one        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Senior subordinated notes due in 2021 | Redemption period three        
Debt Instrument        
Redemption price percentage     101.00%  
Senior subordinated notes | Senior subordinated notes due in 2021 | Redemption period three        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Unsecured Notes        
Debt Instrument        
Debt Instrument, interest rate, stated percentage     10.00%  
Debt amount $ 2,200,000,000      
Capitalized costs during period 48,900,000      
Debt discount capitalized     $ 0 0
Senior subordinated notes | Unsecured Notes | Redemption period one        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Unsecured Notes | Redemption period three        
Debt Instrument        
Redemption price percentage     101.00%  
Senior subordinated notes | Unsecured Notes | Redemption period three        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Secured Notes        
Debt Instrument        
Debt Instrument, interest rate, stated percentage     7.00%  
Debt amount 950,000,000.0      
Capitalized costs during period $ 19,500,000      
Debt discount capitalized     $ 0 $ 0
Senior subordinated notes | Secured Notes | Redemption period one        
Debt Instrument        
Redemption price percentage     100.00%  
Senior subordinated notes | Secured Notes | Redemption period three        
Debt Instrument        
Redemption price percentage     101.00%  
Senior subordinated notes | Secured Notes | Redemption period three        
Debt Instrument        
Redemption price percentage     100.00%