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Common Stock - Sales, Repurchases, and Issuances of Company Capital Stock Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Apr. 23, 2018
Dec. 31, 2016
Class of Stock [Line Items]          
Profit-sharing plan shares, net, value   $ 1,850,000      
Common Stock          
Class of Stock [Line Items]          
Shares exercised (in shares) 1,263,121 697,833      
Stock repurchased during period (in shares)   186,715      
Profit-sharing plan shares, net, value   $ 2,000      
Deferred Compensation, Share-based Payments | Deferred Profit Sharing          
Class of Stock [Line Items]          
Stock repurchased during period (in shares)   186,715      
Profit-sharing plan shares, net, value   $ 1,850,000      
Performance Based Restricted Stock Units (RSUs), 2016 | Equity Incentive Plan          
Class of Stock [Line Items]          
Shares repurchased by Company after exercise   $ 302,000      
Shares repurchased by Company after exercise (in shares)   37,870      
Class B Common Stock          
Class of Stock [Line Items]          
Amount authorized for purchase     $ 250,000,000 $ 250,000,000 $ 200,000,000
Class B Common Stock | Private Placement          
Class of Stock [Line Items]          
Number of shares sold (in shares) 0        
Class B Common Stock | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits          
Class of Stock [Line Items]          
Share-based compensation tax withholding payment $ 8,859,000 $ 301,000      
Deferred compensation arrangement with individual, shares issued (in shares) 339,503 683,072      
Deferred compensation arrangement with individual, shares issued, gross (in shares) 556,475 720,827      
Shares withheld for tax withholding obligation (in shares) 216,972 37,755      
Class B Common Stock | Common Stock          
Class of Stock [Line Items]          
Shares exercised, net of shares withheld (in shares)   697,833      
Shares withheld for cost of options and tax withholding obligation   561,667      
Class B Common Stock | Bonus Plan Incentive          
Class of Stock [Line Items]          
Shares exercised, net of shares withheld (in shares) 79,961        
Shares withheld for cost of options and tax withholding obligation 46,077        
Share-based compensation tax withholding payment $ 2,037,000        
Shares exercised (in shares) 126,038        
Class B Common Stock | Stock Option          
Class of Stock [Line Items]          
Shares exercised, net of shares withheld (in shares) 1,263,121        
Shares withheld for cost of options and tax withholding obligation 262,210        
Share-based compensation tax withholding payment $ 7,158,000 $ 1,341,000      
Cash used to settle award $ 1,751,000        
Class B Common Stock | Stock Option | Common Stock          
Class of Stock [Line Items]          
Cash used to settle award   $ 724,000