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Debt (Debt Repurchases) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 25, 2014
Mar. 19, 2013
Debt Instrument [Line Items]        
Gain (loss) on extinguishment of debt $ 5,319,000 $ (4,795,000)    
Amended Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 100,000,000.0      
Senior Notes and Term Loan        
Debt Instrument [Line Items]        
Debt instrument, repurchased face amount On February 11, 2021, the Company’s Board of Directors authorized a new repurchase program for repurchases/retirements of the above referenced Senior Notes and term loan, subject to certain limitations up to an aggregate maximum of $100.0 million through December 2022.      
Senior Notes        
Debt Instrument [Line Items]        
Gain (loss) on extinguishment of debt $ 5,300,000      
Senior Notes | 6.00% Senior Notes due 2026        
Debt Instrument [Line Items]        
Stated interest rate 6.00% 6.00%    
Senior Notes | 5.875% Senior Notes due 2024        
Debt Instrument [Line Items]        
Stated interest rate 5.875% 5.875% 5.875%  
Debt instrument, repurchased face amount $ 7,500,000      
Percentage of principal amount redeemed 77.28%      
Repurchase amount $ 5,800,000      
Senior Notes | 5.125% Senior Notes due 2023        
Debt Instrument [Line Items]        
Stated interest rate 5.125% 5.125%   5.125%
Debt instrument, repurchased face amount $ 18,200,000      
Percentage of principal amount redeemed 78.99%      
Repurchase amount $ 14,300,000      
Senior Notes | 5.875% Senior Notes due 2022        
Debt Instrument [Line Items]        
Stated interest rate 5.875% 5.875%    
Debt instrument, repurchased face amount   $ 56,000,000.0    
Percentage of principal amount redeemed   97.55%    
Repurchase amount   $ 54,700,000    
Gain (loss) on extinguishment of debt   $ 900,000