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Equity Compensation (Narrative) (Details)
3 Months Ended
Mar. 31, 2020
votes
$ / shares
shares
Dec. 31, 2019
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.25  
Share Based Compensation Arrangement By Share Based Payment Award Performance Period 3 years  
Period for recognition of unrecognized compensation costs 2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Description The 2018 Plan uses a fungible share-counting method, under which each Common Share underlying an award of stock options or stock appreciation rights ("SAR") will count against the number of total shares available under the 2018 Plan as one share; and each Common Share underlying any award other than a stock option or a SAR will count against the number of total shares available under the 2018 Plan as two shares. Shares underlying awards made under the 2003 Plan or 2013 Plan that are forfeited or remain unpurchased or undistributed upon termination or expiration of the awards will become available under the 2018 Plan for use in future awards. Any Common Shares that are added back to the 2018 Plan as the result of forfeiture, termination or expiration of an award granted under the 2018 Plan or the 2013 Plan will be added back in the same manner such shares were originally counted against the total number of shares available under the 2018 Plan or 2013 Plan, as applicable. Each Common Share that is added back to the 2018 Plan due to a forfeiture, termination or expiration of an award granted under the 2003 Plan will be added back as one Common Share.  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net award activity (in shares) 936,494  
Award vesting period 3 years  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net award activity (in shares) 1,859,054  
Award requisite service period 3 years  
Performance achievement level, lower range 0.00%  
Performance achievement level, upper range 150.00%  
Performance achievement level, target range 100.00%  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 10 years  
Award vesting period 4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [1] 825,893  
2013 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Share Awards Underlying from 2003 Plan 989,819  
2018 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 3,000,000  
Weighted Average | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Period for recognition of unrecognized compensation costs 3 years  
Class B Common Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Par or Stated Value Per Share | $ / shares $ 0 $ 0
Common Stock, Number of Votes | votes 10  
Common Stock, Difference in Dividend Rate 10.00%  
Common Stock, Shares, Issued 6,357  
Common Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Par or Stated Value Per Share | $ / shares $ 0 $ 0
Common Stock, Holders Percentage of Total Outstanding 99.90%  
[1]
 *
Shares available for grant under the 2018 Plan as of March 31, 2020 reduced by net restricted stock and restricted stock unit award activity of 936,494 shares and performance share and performance share unit award activity of 1,859,054 shares.