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Share-Based Payments (Summary Of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Performance Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Number of units 238,573 76,227  
Granted, Number of units 218,699 186,554 78,831
Exercised, Number of units (6,870) (3,702)  
Forfeited, Number of units (28,817) (20,506) (2,604)
Outstanding ending balance, Number of units 421,585 238,573 76,227
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 23.38 $ 21.99  
Granted, Weighted average grant date fair falue (per share) 24.57 23.82 $ 21.99
Exercised, Weighted average grant date fair value (per share) 22.22 22.22  
Forfeited, Weighted average grant date fair value (per share) 23.23 22.38 22.01
Outstanding ending balance, Weighted average grant date fair value (per share) $ 24.03 $ 23.38 $ 21.99
Restricted Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Number of units 403,587 271,924  
Granted, Number of units 20,528 237,645 278,771
Exercised, Number of units (28,887) (65,293)  
Forfeited, Number of units (62,274) (40,689) (6,847)
Outstanding ending balance, Number of units 332,954 403,587 271,924
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 22.32 $ 21.78  
Granted, Weighted average grant date fair falue (per share) 26.38 22.86 $ 21.78
Exercised, Weighted average grant date fair value (per share) 22.53 22.01  
Forfeited, Weighted average grant date fair value (per share) 21.56 22.32 22.01
Outstanding ending balance, Weighted average grant date fair value (per share) $ 22.70 $ 22.32 $ 21.78
Deferred Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Number of units 42,289 19,624  
Granted, Number of units 29,072 22,665 19,624
Exercised, Number of units (13,365)    
Outstanding ending balance, Number of units 57,996 42,289 19,624
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 22.33 $ 21.99  
Granted, Weighted average grant date fair falue (per share) 26.07 22.66 $ 21.99
Exercised, Weighted average grant date fair value (per share) 22.34    
Outstanding ending balance, Weighted average grant date fair value (per share) $ 24.21 $ 22.33 $ 21.99