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Stock-Based Compensation (Summary Of Performance Unit Activity) (Details) - Performance Units [Member]
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested shares/units at December 31, Number of Shares 407,000
Granted, Number of Shares/Units 1,502,000
Vested, Number of Shares/Units (414,000)
Forfeited, Number of Shares/Units (290,000)
Unvested shares/units at September 30, Number of Shares 1,205,000
Unvested shares/units at December 31, Weighted Average Fair Value | $ / shares $ 36.65
Granted, Weighted Average Fair Value | $ / shares 8.60
Vested, Weighted Average Fair Value | $ / shares 7.62
Forfeited, Weighted Average Fair Value | $ / shares 11.32
Unvested shares at September 30, Weighted Average Fair Value | $ / shares $ 13.70
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 (15,632)
Forfeited, Number of Shares/Units (76,281)
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)