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Common Stock - Sales, Repurchases, and Issuances of Company Capital Stock Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 23, 2018
Sep. 30, 2016
Class of Stock [Line Items]            
Profit-sharing plan shares, net, value $ 2,542,000 $ 726,000 $ 6,970,000 $ 1,939,000    
Common Stock            
Class of Stock [Line Items]            
Stock repurchased during period (in shares) 164,266 97,140 549,834 258,103    
Shares exercised (in shares) 1,321,475 322,004 3,506,103 2,979,031    
Profit-sharing plan shares, net, value $ 1,000 $ 1,000 $ 5,000 $ 3,000    
Deferred Compensation, Share-based Payments [Member] | Deferred Profit Sharing            
Class of Stock [Line Items]            
Stock repurchased during period (in shares)     549,834 258,103    
Profit-sharing plan shares, net, value     $ 6,970,000 $ 1,939,000    
Performance Based Restricted Stock Units (RSUs), 2016 | Equity Incentive Plan            
Class of Stock [Line Items]            
Shares repurchased by Company after exercise (in shares)     128,176 632,859    
Shares repurchased by Company after exercise     $ 1,454,000 $ 4,952,000    
Class B Common Stock            
Class of Stock [Line Items]            
Amount authorized for purchase $ 250,000,000   $ 250,000,000   $ 250,000,000 $ 200,000,000
Stock repurchased during period (in shares)     3,769,345      
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     $ 1,877,000 $ 4,972,000    
Shares withheld for tax withholding obligation (in shares)     181,228 679,806    
Deferred compensation arrangement with individual, shares issued (in shares)     2,984,531 2,233,807    
Deferred compensation arrangement with individual, shares issued, gross (in shares)     3,165,759 2,913,613    
Class B Common Stock | Common Stock            
Class of Stock [Line Items]            
Shares exercised, net of shares withheld (in shares)       2,979,031    
Shares exercised (in shares)       4,372,294    
Shares issued for cash (in shares)       1,125,506    
Shares withheld for cost of options and tax withholding obligation       1,393,263    
Class B Common Stock | Stock Option            
Class of Stock [Line Items]            
Shares exercised, net of shares withheld (in shares)     3,506,103      
Shares exercised (in shares)     4,864,944      
Shares issued for cash (in shares)     1,761,769      
Cash used to settle award     $ 7,776,000      
Shares withheld for cost of options and tax withholding obligation     1,358,841      
Share-based compensation tax withholding payment     $ 3,618,000 $ 2,270,000    
Class B Common Stock | Stock Option | Common Stock            
Class of Stock [Line Items]            
Cash used to settle award       $ 3,054,000    
Private Placement | Common Stock            
Class of Stock [Line Items]            
Shares issued during period (in shares)     169 64,509    
Private Placement | Class B Common Stock            
Class of Stock [Line Items]            
Number of shares sold (in shares)     4,574,567 791,873    
Stock repurchased during period (in shares)       622,873    
Sale of stock, consideration received     $ 58,349,000 $ 4,510,000    
Private Placement, Direct Investor Investment | Class B Common Stock            
Class of Stock [Line Items]            
Number of shares sold (in shares)     805,053 169,000    
Sale of stock, consideration received     $ 12,462,000 $ 1,224,000