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Stock-Based Compensation (Summary Of Performance Unit Activity) (Details) - Performance Units [Member]
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested shares/units at December 31, 2016, Number of Shares 719,000
Granted, Number of Shares/Units 1,197,000
Vested, Number of Shares/Units
Forfeited, Number of Shares/Units
Unvested shares/units at March 31, 2017, Number of Shares 1,916,000
Unvested shares/units at December 31, 2016, Weighted Average Fair Value | $ / shares $ 11.46
Granted, Weighted Average Fair Value | $ / shares 10.47
Vested, Weighted Average Fair Value | $ / shares
Forfeited, Weighted Average Fair Value | $ / shares
Unvested shares at March 31, 2017, Weighted Average Fair Value | $ / shares $ 10.84
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