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Stock-Based Compensation (Summary of Equity-Classified Stock Options Outstanding and Options Exercisable) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding - Options Outstanding at December 31, 2019 (in shares) 4,635 5,178 6,020 5,416
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 15.26 $ 17.06 $ 19.43 $ 23.46
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 2 years 10 months 24 days      
Options Exercisable - Options Exercisable at December 31, 2019 (in shares) 4,213      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 16.01      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 2 years 9 months 18 days      
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) $ 5.22      
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 29.42      
Options Outstanding - Options Outstanding at December 31, 2019 (in shares) 3,467      
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 8.63      
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 3 years 4 months 24 days      
Options Exercisable - Options Exercisable at December 31, 2019 (in shares) 3,045      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 8.74      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days      
Range of Exercise Prices $30.59-$35.64        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 30.59      
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 35.64      
Options Outstanding - Options Outstanding at December 31, 2019 (in shares) 644      
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 30.60      
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 1 year 10 months 24 days      
Options Exercisable - Options Exercisable at December 31, 2019 (in shares) 644      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 30.60      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 1 year 10 months 24 days      
Range of Exercise Prices $38.20-$38.97        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 38.20      
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 38.97      
Options Outstanding - Options Outstanding at December 31, 2019 (in shares) 434      
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 38.97      
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 10 months 24 days      
Options Exercisable - Options Exercisable at December 31, 2019 (in shares) 434      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 38.97      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 10 months 24 days      
Range of Exercise Prices $46.55-$46.55        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit (in dollars per share) $ 46.55      
Range of Exercise Prices, Upper Range Limit (in dollars per share) $ 46.55      
Options Outstanding - Options Outstanding at December 31, 2019 (in shares) 90      
Options Outstanding - Weighted Average Exercise Price (in dollars per share) $ 46.55      
Options Outstanding - Weighted Average Remaining Contractual Life (Years) 1 year 4 months 24 days      
Options Exercisable - Options Exercisable at December 31, 2019 (in shares) 90      
Options Exercisable - Weighted Average Exercise Price (in dollars per share) $ 46.55      
Options Exercisable - Weighted Average Remaining Contractual Life (Years) 1 year 4 months 24 days