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Debt- 2028 Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 10, 2017
Debt Disclosure [Abstract]        
Long-term Debt, Gross $ 1,095,000 $ 946,000    
Debt Instrument        
Payments of Debt Issuance Costs $ 3,964 0 $ 7,400  
Debt Instrument, Covenant Compliance The Company is in compliance with all of the above covenants      
Redemption prior to April 15, 2023 [Member]        
Debt Instrument        
Debt Instrument, Redemption Price, Percentage of Principle Amount Remaining Outstanding 60.00%      
Percentage payment of Principle amount 40.00%      
Senior Unsecured Notes 2028        
Debt Disclosure [Abstract]        
Long-term Debt, Gross $ 400,000 0    
Debt Instrument, Interest Rate, Stated Percentage 4.375%      
Debt Instrument        
Debt Instrument, Interest Rate, Stated Percentage 4.375%      
Payments of Debt Issuance Costs $ 4,000      
Debt Instrument, Redemption Price, Percentage 100.00%      
Redemption price, change of control 101.00%      
Event of default percentage 25.00%      
Debt Instrument, Covenant Compliance The Company is in compliance with all of the above covenants      
Senior Unsecured Notes 2028 | Redemption After 2023 [Member]        
Debt Instrument        
Debt Instrument, Redemption Price, Percentage 102.188%      
Senior Unsecured Notes 2028 | Redemption After 2024 [Member]        
Debt Instrument        
Debt Instrument, Redemption Price, Percentage 101.094%      
Senior Unsecured Notes 2028 | Redemption after 2025 and thereafter [Member]        
Debt Instrument        
Debt Instrument, Redemption Price, Percentage 100.00%      
Senior Unsecured Notes 2028 | Redemption prior to April 15, 2023 [Member]        
Debt Instrument        
Debt Instrument, Redemption Price, Percentage 104.375%      
Senior unsecured notes due 2026        
Debt Disclosure [Abstract]        
Long-term Debt, Gross $ 550,000 $ 550,000   $ 550,000
Debt Instrument, Interest Rate, Stated Percentage 4.625%     4.625%
Debt Instrument        
Debt Instrument, Interest Rate, Stated Percentage 4.625%     4.625%
Debt Instrument, Redemption Price, Percentage   100.00%    
Redemption price, change of control   101.00%    
Event of default percentage   25.00%    
Debt Instrument, Covenant Compliance The Company is in compliance with all of the above covenants