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Debt - Senior Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 29, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 20, 2016
Oct. 28, 2016
Debt Instrument [Line Items]            
Proceeds from Issuance of Senior Long-term Debt   $ 312,000 $ 0      
Senior Unsecured Notes due 2024 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 500,000
Stated interest rate (percentage)   4.75%   4.75%   4.75%
Debt Instrument, Redemption Price, Percentage   100.00%        
Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   103.563%        
Debt Instrument, Redemption Period, Start Date   Nov. 01, 2019        
Debt Instrument, Redemption Period, End Date   Oct. 31, 2020        
Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   102.375%        
Debt Instrument, Redemption Period, Start Date   Nov. 01, 2020        
Debt Instrument, Redemption Period, End Date   Oct. 31, 2021        
Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   101.188%        
Debt Instrument, Redemption Period, Start Date   Nov. 01, 2021        
Debt Instrument, Redemption Period, End Date   Oct. 31, 2022        
Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   100.00%        
Debt Instrument, Redemption Period, Start Date   Nov. 01, 2022        
Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period Five [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   104.75%        
Debt Instrument, Redemption Period, Start Date   Oct. 28, 2016        
Debt Instrument, Redemption Period, End Date   Oct. 31, 2019        
Senior Unsecured Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount         $ 500,000  
Stated interest rate (percentage)   5.375%   5.375% 5.375%  
Debt Instrument, Redemption Price, Percentage   100.00%        
Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   104.031%        
Debt Instrument, Redemption Period, Start Date   May 31, 2020        
Debt Instrument, Redemption Period, End Date   May 30, 2021        
Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   102.688%        
Debt Instrument, Redemption Period, Start Date   May 31, 2021        
Debt Instrument, Redemption Period, End Date   May 30, 2022        
Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   101.344%        
Debt Instrument, Redemption Period, Start Date   May 31, 2022        
Debt Instrument, Redemption Period, End Date   May 30, 2023        
Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   100.00%        
Debt Instrument, Redemption Period, Start Date   May 31, 2023        
Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period Five [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price, Percentage   105.375%        
Debt Instrument, Redemption Period, Start Date   Dec. 20, 2016        
Debt Instrument, Redemption Period, End Date   May 30, 2020        
Senior Unsecured Additional Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount $ 300,000          
Stated interest rate (percentage) 5.375%          
Proceeds from Issuance of Senior Long-term Debt $ 308,400          
Maximum [Member] | Senior Unsecured Notes due 2024 [Member] | Debt Instrument, Redemption, Period Five [Member]            
Debt Instrument [Line Items]            
Debt Instrument Percentage Eligible for Redemption   35.00%        
Maximum [Member] | Senior Unsecured Notes due 2025 [Member] | Debt Instrument, Redemption, Period Five [Member]            
Debt Instrument [Line Items]            
Debt Instrument Percentage Eligible for Redemption   35.00%