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Fair Value Measurements (Additional Information Regarding Fair Value Measurements) (Details) - USD ($)
Sep. 30, 2020
Feb. 25, 2020
Dec. 31, 2019
Nov. 15, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Carrying Value $ 1,732,069,000   $ 742,926,000  
Level 2 [Member] | Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Closing trading price per $100 as of the last day of trading for the quarter 100      
Unsecured Debt [Member] | 2030 Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument, face amount 750,000,000.0 $ 750,000,000.0    
Unsecured Debt [Member] | 2027 Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument, face amount 750,000,000.0     $ 750,000,000.0
Senior Notes [Member] | 2030 Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Carrying Value 738,811,000      
Senior Notes [Member] | 2030 Notes [Member] | Level 2 [Member] | Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value 798,443,000      
Senior Notes [Member] | 2027 Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Carrying Value 743,593,000      
Senior Notes [Member] | 2027 Notes [Member] | Level 2 [Member] | Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value $ 862,103,000