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Stock-Based Compensation (Summary of Equity-Classified Performance Units) (Details) - Equity-Classified Performance Units [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested shares/units at January 1, Number of Shares 719,000 407,000 223,000
Granted, Number of Shares/Units 1,197,000 1,503,000 443,000
Vested, Number of Shares/Units (325,000) (889,000) (259,000)
Forfeited, Number of Shares/Units (507,000) (302,000)
Unvested shares/units at December 31, Number of Shares 1,084,000 719,000 407,000
Unvested shares/units at January 1, Weighted Average Fair Value $ 11.46 $ 36.65 $ 40.44
Granted, Weighted Average Fair Value 10.47 8.60 35.22
Vested, Weighted Average Fair Value 12.21 12.78 37.46
Forfeited, Weighted Average Fair Value 9.53 11.26
Unvested shares at December 31, Weighted Average Fair Value $ 10.12 $ 11.46 $ 36.65
Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Vesting period for stock awards from grant date 3 years    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of Shares/Units 0    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Number of Shares/Units 2    
Workforce Reduction [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested, Number of Shares/Units   (22,918)  
Forfeited, Number of Shares/Units   (87,595)  
Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested, Number of Shares/Units   (37,590)  
Forfeited, Number of Shares/Units   (195,834)