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Debt (5.875% Senior Notes Due 2024) (Details) - USD ($)
12 Months Ended
Sep. 25, 2014
Dec. 31, 2018
Dec. 31, 2017
Mar. 19, 2013
Feb. 10, 2011
Debt Instrument [Line Items]          
Capitalized loan costs   $ 31,100,000 $ 42,300,000    
Senior Notes | 5.125% Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 300,000,000.0  
Stated interest rate   5.125% 5.125% 5.125%  
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]          
Debt instrument, face amount $ 250,000,000.0        
Stated interest rate 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 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
Stated interest rate   6.625% 6.625% 6.00% 6.625%