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Share-Based Payments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 01, 2018
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share units reclassified to temporary equity   $ 569,000
Stock Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs   $ 10,976,000
Senior Executive and Employee Performance Share Unit Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Market value of shares vested and released $ 31.35  
Share unit liability $ 1,400,000  
Share unit liability, fair value attributable to past service 6,701,000  
Share units reclassified to temporary equity $ 6,132,000  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average grant date fair value of options granted   $ 7.67
Unrecognized compensation costs, period for recognition   2 years 6 months
Performance Share Units, Equity Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs   $ 13,656,668
Unrecognized compensation costs, period for recognition   2 years 2 months 12 days
Performance Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Shares   223,484
Performance Share Units [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%
Performance Share Units [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%
Restricted Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Shares   88,120
Restricted Stock Units, Liability Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs   $ 30,024
Unrecognized compensation costs, period for recognition   7 months 6 days
Restricted Stock Units, Equity Classified [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs   $ 5,696,935
Unrecognized compensation costs, period for recognition   2 years 9 months 18 days
Deferred Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs   $ 0