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Long-Term Debt - Senior Notes Carrying Amount (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Details for the Senior Notes    
Total $ 681,270 $ 680,385
Senior Notes | 6.125% Senior Notes    
Details for the Senior Notes    
Principal balance 550,000 550,000
Less: Debt issue cost 3,367 3,688
Less: debt discount 3,251 3,540
Total $ 543,382 $ 542,772