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Debt (5.875% Senior Notes) (Details) - USD ($)
12 Months Ended
Sep. 25, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 03, 2013
Mar. 19, 2013
Debt Instrument [Line Items]            
Line of Credit, amount outstanding   $ 490,843,000 $ 270,559,000      
Loss on extinguishment of debt   $ 0 $ 0 $ 15,885,000    
5.875% Senior Notes | Redemption, Period 2017            
Debt Instrument [Line Items]            
Redemption price percentage   104.406%        
5.875% Senior Notes | Redemption, Period 2018            
Debt Instrument [Line Items]            
Redemption price percentage   102.938%        
5.875% Senior Notes | Redemption, Period 2019            
Debt Instrument [Line Items]            
Redemption price percentage   101.469%        
5.875% Senior Notes | 2020 and thereafter            
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%      
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 | 2020 and thereafter            
Debt Instrument [Line Items]            
Redemption price percentage 101.958%          
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%
Percentage of principal amount redeemable   101.00%        
Debt covenant, asset proceeds, excess proceeds   $ 25,000,000        
Debt covenant, indenture agreement, period after notice   60 days        
Senior Notes | 5.125% Senior Notes | Redemption, Period 2018            
Debt Instrument [Line Items]            
Redemption price percentage   102.563%        
Senior Notes | 5.125% Senior Notes | Redemption, Period 2019            
Debt Instrument [Line Items]            
Redemption price percentage   101.708%        
Senior Notes | 5.125% Senior Notes | 2020 and thereafter            
Debt Instrument [Line Items]            
Redemption price percentage   100.854%        
Senior Notes | 5.125% Senior Notes | Maximum            
Debt Instrument [Line Items]            
Notice period prior to redemption   60 days        
Senior Notes | 5.125% Senior Notes | Minimum            
Debt Instrument [Line Items]            
Notice period prior to redemption   30 days        
Senior Notes | 5.875% Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 250,000,000.0  
Stated interest rate   5.875% 5.875%      
Percentage of principal amount redeemable   101.00%        
Debt covenant, asset proceeds, excess proceeds   $ 25,000,000        
Debt covenant, indenture agreement, period after notice   60 days        
Senior Notes | 5.875% Senior Notes | Maximum            
Debt Instrument [Line Items]            
Notice period prior to redemption   60 days        
Senior Notes | 5.875% Senior Notes | Minimum            
Debt Instrument [Line Items]            
Notice period prior to redemption   30 days        
Senior Notes | 7.75% Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate   7.75%