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Debt (6.00% Senior Notes) (Details) - 6.00% Senior Notes due 2026 - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Apr. 18, 2016
Debt Instrument [Line Items]      
Stated interest rate 6.00% 6.00%  
Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 6.00% 6.00%  
Debt instrument, face amount     $ 350,000,000.0
Debt instrument, coupon rate 6.00%    
Debt instrument, yield to maturity 6.00%    
Debt instrument, payment terms Interest on the 6.00% Senior Notes is payable semi-annually on April 15 and October 15 of each year, commencing on October 15, 2016.    
Debt instrument, frequency of payment semi-annually    
Debt instrument, commencement date of first required payment Oct. 15, 2016    
Debt instrument, maturity date Apr. 15, 2026    
Percentage of principal amount redeemable 101.00%    
Violation or event of default, interest payment failure, term 30 days    
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset $ 50,000,000.0    
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term 60 days    
Senior Notes | Redemption, Period On Or Prior To April 15, 2019      
Debt Instrument [Line Items]      
Percentage of principal amount redeemed 35.00%    
Redemption price percentage 106.00%    
Senior Notes | Redemption, Period On Or Prior To April 15, 2019 | Minimum      
Debt Instrument [Line Items]      
Notice period prior to redemption 30 days    
Senior Notes | Redemption, Period On Or Prior To April 15, 2019 | Maximum      
Debt Instrument [Line Items]      
Notice period prior to redemption 60 days    
Senior Notes | Redemption, Period Before April 15, 2021      
Debt Instrument [Line Items]      
Redemption price percentage 100.00%