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Share-Based Payments (Summary of Share Unit Activity) (Details)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Performance Share Units, Equity Classified Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 243,968
Granted, Number of units | shares 95,212
Reclassification on modification, Number of units | shares 81,533
Vested and settled, Number of units | shares
Forfeited, Number of units | shares (5,106)
Outstanding ending balance, Number of units | shares 415,607
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 27.48
Granted, Weighted average grant date fair value (per share) | $ / shares 31.67
Reclassification on modification, WA grant date fair value (per share) | $ / shares 24.47
Vested and settled, Weighted average grant date fair value (per share) | $ / shares
Forfeited, Weighted average grant date fair value (per share) | $ / shares 27.48
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 27.85
Performance Share Units, Liability Classified Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 311,329 [1]
Granted, Number of units | shares 89,643 [1]
Reclassification on modification, Number of units | shares (81,533) [1]
Vested and settled, Number of units | shares (49,873) [1]
Forfeited, Number of units | shares (14,845) [1]
Outstanding ending balance, Number of units | shares 254,721 [1]
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 23.96 [1]
Granted, Weighted average grant date fair value (per share) | $ / shares 31.67 [1]
Reclassification on modification, WA grant date fair value (per share) | $ / shares 24.66 [1]
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 23.64 [1]
Forfeited, Weighted average grant date fair value (per share) | $ / shares 26.09 [1]
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 26.39 [1]
Restricted Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 160,009
Granted, Number of units | shares 801
Reclassification on modification, Number of units | shares
Vested and settled, Number of units | shares (151,591)
Forfeited, Number of units | shares
Outstanding ending balance, Number of units | shares 9,219
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 23.37
Granted, Weighted average grant date fair value (per share) | $ / shares 32.66
Reclassification on modification, WA grant date fair value (per share) | $ / shares
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 23.24
Forfeited, Weighted average grant date fair value (per share) | $ / shares
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 26.40
Deferred Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 73,520
Granted, Number of units | shares 8,624
Reclassification on modification, Number of units | shares
Vested and settled, Number of units | shares
Forfeited, Number of units | shares
Outstanding ending balance, Number of units | shares 82,144
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 25.41
Granted, Weighted average grant date fair value (per share) | $ / shares 32.19
Reclassification on modification, WA grant date fair value (per share) | $ / shares
Vested and settled, Weighted average grant date fair value (per share) | $ / shares
Forfeited, Weighted average grant date fair value (per share) | $ / shares
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 26.12
[1] Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015 that are cash-settled and not subject to market vesting conditions.