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Stock-Based Compensation (Summary Of Performance Unit Activity) (Details) - Performance Units [Member]
3 Months Ended
Mar. 31, 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 1,061,000
Vested, Number of Shares/Units (5,000)
Forfeited, Number of Shares/Units (38,000)
Unvested shares/units at March 31, Number of Shares 1,425,000
Unvested shares/units at December 31, Weighted Average Fair Value | $ / shares $ 36.65
Granted, Weighted Average Fair Value | $ / shares 8.31
Vested, Weighted Average Fair Value | $ / shares 8.08
Forfeited, Weighted Average Fair Value | $ / shares 8.08
Unvested shares at March 31, Weighted Average Fair Value | $ / shares $ 14.47
Number in excess of individual award limits excluded 441,450
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 (5,168)