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Share-Based Payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 434,248 243,968
Granted, Shares 240,803 136,073 7,714
Transferred to (from) equity awards on modification, Shares 257,659 81,533 257,934
Vested and settled, Shares (212,263) (27,326)
Forfeited, Shares (50,159) (21,680)
Outstanding ending balance, Shares 670,288 434,248 243,968
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 27.83 $ 27.48
Granted, Weighted average grant date fair value (per share) 35.63 30.28 31.40
Transferred to (from) equity awards on modification, WA grant date fair value (per share) 31.30 24.47 27.34
Vested and settled, Weighted average grant date fair value (per share) 33.78 26.82
Forfeited, Weighted average grant date fair value (per share) 31.41 27.43
Outstanding ending balance, Weighted average grant date fair value (per share) $ 31.46 $ 27.83 $ 27.48
Performance Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 259,241 311,329 421,585
Granted, Shares 98,775 257,117
Transferred to (from) equity awards on modification, Shares (257,659) (81,533) (257,934)
Vested and settled, Shares (49,873) (68,683)
Forfeited, Shares (1,582) (19,457) (40,756)
Outstanding ending balance, Shares 259,241 311,329
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 26.38 $ 23.96 $ 24.03
Granted, Weighted average grant date fair value (per share) 31.21 23.32
Transferred to (from) equity awards on modification, WA grant date fair value (per share) 26.38 24.66 23.86
Vested and settled, Weighted average grant date fair value (per share) 23.64 23.08
Forfeited, Weighted average grant date fair value (per share) 26.45 26.39 22.75
Outstanding ending balance, Weighted average grant date fair value (per share) $ 26.38 $ 23.96
Restricted Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 125,152
Granted, Shares 91,251 125,152
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares
Forfeited, Shares (8,417)
Outstanding ending balance, Shares 207,986 125,152
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 26.93
Granted, Weighted average grant date fair value (per share) 32.10 26.93
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share)
Forfeited, Weighted average grant date fair value (per share) 32.00
Outstanding ending balance, Weighted average grant date fair value (per share) $ 28.99 $ 26.93
Restricted Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 4,666 160,009 332,954
Granted, Shares 66 878 4,543
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares (4,732) (156,221) (162,306)
Forfeited, Shares (15,182)
Outstanding ending balance, Shares 4,666 160,009
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 26.42 $ 23.37 $ 22.70
Granted, Weighted average grant date fair value (per share) 34.70 32.30 29.33
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share) 26.54 23.33 22.23
Forfeited, Weighted average grant date fair value (per share) 22.68
Outstanding ending balance, Weighted average grant date fair value (per share) $ 26.42 $ 23.37
Deferred Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 93,487 73,520 57,996
Granted, Shares 26,553 19,967 17,371
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares (6,605) (1,847)
Forfeited, Shares
Outstanding ending balance, Shares 113,435 93,487 73,520
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 26.32 $ 25.41 $ 24.21
Granted, Weighted average grant date fair value (per share) 33.42 29.67 29.41
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share) 23.16 25.28
Forfeited, Weighted average grant date fair value (per share)
Outstanding ending balance, Weighted average grant date fair value (per share) $ 28.16 $ 26.32 $ 25.41