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Debt (5.875% Senior Notes Due 2024) (Details) - USD ($)
12 Months Ended
Sep. 25, 2014
Dec. 31, 2015
Dec. 31, 2014
Mar. 19, 2013
Feb. 10, 2011
Debt Instrument [Line Items]          
Capitalized loan costs   $ 57,500,000 $ 53,900,000    
5.875% Senior Notes due 2024          
Debt Instrument [Line Items]          
Capitalized loan costs $ 4,600,000        
Senior Notes | 5.125% Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 250,000,000.0     $ 300,000,000.0  
Stated interest rate   5.125% 5.125% 5.125%  
Redemption price percentage   105.125%      
Capitalized loan costs   $ 6,800,000      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2019          
Debt Instrument [Line Items]          
Redemption price percentage   101.708%      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2020          
Debt Instrument [Line Items]          
Redemption price percentage   100.854%      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2021          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%      
Senior Notes | 5.875% Senior Notes due 2024          
Debt Instrument [Line Items]          
Stated interest rate 5.875% 5.875% 5.875% 5.875%  
Violation or event of default, interest payment failure, term 30 days        
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset $ 25,000,000        
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term 60 days        
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2016          
Debt Instrument [Line Items]          
Redemption price percentage 105.875%        
Percentage of principal amount redeemed 35.00%        
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2017          
Debt Instrument [Line Items]          
Redemption price percentage 100.00%        
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2019          
Debt Instrument [Line Items]          
Redemption price percentage 102.938%        
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2020          
Debt Instrument [Line Items]          
Redemption price percentage 101.958%        
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2021          
Debt Instrument [Line Items]          
Redemption price percentage 100.979%        
Senior Notes | 5.875% Senior Notes due 2024 | 2022 and thereafter          
Debt Instrument [Line Items]          
Redemption price percentage 100.00%        
Senior Notes | 6.625% Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount         $ 300,000,000.0
Stated interest rate 6.625% 6.625% 6.625% 6.625% 6.625%
Senior Notes | 6.625% Senior Notes | Redemption, Period 2016          
Debt Instrument [Line Items]          
Redemption price percentage   103.3125%      
Senior Notes | 6.625% Senior Notes | Redemption, Period 2017          
Debt Instrument [Line Items]          
Redemption price percentage   102.2083%      
Senior Notes | 6.625% Senior Notes | Redemption, Period 2019          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%