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Debt (6.00% Senior Notes) (Details) - Senior Notes - USD ($)
12 Months Ended
Sep. 25, 2014
Dec. 31, 2017
Dec. 31, 2016
Apr. 18, 2016
6.00% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate   6.00%   6.00%
Debt instrument, face amount       $ 350,000,000
Loan costs       $ 6,000,000
Percentage of principal amount redeemable   101.00%    
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   $ 50,000,000    
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term   60 days    
6.00% Senior Notes | Minimum        
Debt Instrument [Line Items]        
Notice period prior to redemption   30 days    
6.00% Senior Notes | Maximum        
Debt Instrument [Line Items]        
Notice period prior to redemption   60 days    
6.00% Senior Notes | Redemption, Period On Or Prior To April 15, 2019        
Debt Instrument [Line Items]        
Percentage of principal amount redeemed   35.00%    
Redemption price percentage   106.00%    
6.00% Senior Notes | Redemption, Period Before April 15, 2021        
Debt Instrument [Line Items]        
Redemption price percentage   100.00%    
6.00% Senior Notes | Redemption, Period One        
Debt Instrument [Line Items]        
Redemption price percentage   103.00%    
6.00% Senior Notes | Redemption, Period Two        
Debt Instrument [Line Items]        
Redemption price percentage   102.00%    
6.00% Senior Notes | Redemption, Period Three        
Debt Instrument [Line Items]        
Redemption price percentage   101.00%    
6.00% Senior Notes | Redemption, Period Four        
Debt Instrument [Line Items]        
Redemption price percentage   100.00%    
5.875% Senior Notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate 5.875% 5.875% 5.875%  
Debt instrument, face amount $ 250,000,000.0      
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      
5.875% Senior Notes due 2024 | Redemption, Period Two        
Debt Instrument [Line Items]        
Redemption price percentage 100.00%      
5.875% Senior Notes due 2024 | Redemption, Period Four        
Debt Instrument [Line Items]        
Redemption price percentage 102.938%