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Capital Stock (Narrative) (Details)
$ in Thousands, shares in Millions
Dec. 08, 2016
USD ($)
installment
Dec. 31, 2019
shares
Mar. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of annual installments | installment 3    
Annual installment payment, equity or cash, amount | $ $ 16,670    
Value of agreement | $ $ 50,000    
Class A Voting Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized common shares (in shares) | shares   500.0 500.0
Class B Non-Voting Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized common shares (in shares) | shares   500.0 500.0