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Share-Based Payments (Narrative) (Details)
9 Months Ended 12 Months Ended
May 02, 2016
USD ($)
$ / shares
shares
Aug. 11, 2014
shares
Sep. 30, 2016
USD ($)
item
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share units reclassified to temporary equity     $ (70,000)  
Employee service period     60 days  
Maximum employee contribution, percentage     4.00%  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employer matching contribution, percentage     50.00%  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employer matching contribution, percentage     100.00%  
Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk free interest rate measurement period     5 years  
Expected life measurement period     25 years  
Expected volatility measurement period     5 years  
Unrecognized compensation costs     $ 5,495,000  
Unrecognized compensation costs, period for recognition     2 years 3 months 18 days  
Senior Executive and Employee Performance Share Unit Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining shares authorized for grant | shares 1,000,000      
Weighted average grant date fair value of options granted | $ / shares $ 27.34      
Number of plans | item     2  
Share unit liability $ 2,105,000      
Share units reclassified to temporary equity $ 2,175,000      
Senior Executive and Employee Performance Share Unit Plans [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of units available for grant as a percentage of target     0.00%  
Senior Executive and Employee Performance Share Unit Plans [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of units available for grant as a percentage of target     200.00%  
Sign-on Grant Performance Share Unit Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of tranches | item     4  
Sign-on Grant Performance Share Unit Plans [Member] | Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     2 years  
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Four [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     5 years  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life measurement period     5 years  
Performance Share Units, Equity Classified Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs     $ 5,708,000  
Unrecognized compensation costs, period for recognition     2 years  
Units granted | shares     6,593  
Performance Share Units, Liability Classified Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs     $ 6,215,000  
Unrecognized compensation costs, period for recognition     2 years  
Estimated weighted average price period     20 days  
Units granted | shares [1]     255,728 218,699
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Expected life measurement period     3 years  
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted | shares   102,375    
Restricted Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs     $ 985,000  
Unrecognized compensation costs, period for recognition     8 months 12 days  
Units granted | shares     3,836 20,528
Deferred Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs     $ 0  
Units granted | shares     13,489 29,072
Restricted Share Units and Deferred Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated weighted average price period     20 days  
[1] Liability-classified PSUs include PSUs awarded under the employee PSU plan, the sign-on grant PSU plan, and other PSUs plans in place prior to 2015 that are cash-settled and not subject to market vesting conditions