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Debt Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Aug. 21, 2018
Debt Instrument [Line Items]      
Debt issued $ 1,039,811 $ 1,039,416  
Senior Notes | Senior Notes Due 2026      
Debt Instrument [Line Items]      
Long-term debt outstanding $ 1,050,000    
Senior Notes | 2026 Notes Offering      
Debt Instrument [Line Items]      
Interest rate     5.875%