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Long-Term Incentive Compensation (Summary of Equity-Classified Stock Options Outstanding and Options Exercisable) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding - Options Outstanding at December 31, 2020 (in shares) 3,006 3,850 4,635 5,178
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 8.98 $ 13.39 $ 15.26 $ 17.06
Range of Exercise Prices $5.22-$29.42        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit (in dollars per share) 7.74      
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 29.42      
Options Outstanding - Options Outstanding at December 31, 2020 (in shares) 3,006      
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 8.98      
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 1 year 3 months 18 days      
Options Exercisable - Options Exercisable at December 31, 2021 (in shares) 3,006      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 8.98      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 1 year 3 months 18 days