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Debt - 2026 Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Nov. 10, 2017
Debt Instrument      
Long-term Debt, Gross $ 1,095,000 $ 946,000  
Debt Instrument, Covenant Compliance The Company is in compliance with all of the above covenants    
Senior unsecured notes due 2026      
Debt Instrument      
Long-term Debt, Gross $ 550,000 $ 550,000 $ 550,000
Debt Instrument, Interest Rate, Stated Percentage 4.625%   4.625%
Debt Instrument, Redemption Price, Percentage   100.00%  
Minimum redemption price on or after November 10, 2020   100.00%  
Maximum redemption price on or after November 10, 2020   103.469%  
Redemption price, change of control   101.00%  
Debt Instrument, Covenant Compliance The Company is in compliance with all of the above covenants    
Event of default percentage   25.00%