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Debt - 2026 Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Nov. 10, 2017
Debt Instrument      
Long-term Debt, Gross $ 950,000 $ 946,000  
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%
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%    
Event of default percentage 25.00%