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Common Stock - Sales, Repurchases, and Issuances of Company Capital Stock Narrative (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Apr. 23, 2018
Sep. 30, 2016
Class of Stock [Line Items]            
Profit-sharing plan shares, net, value $ 6,970,000 $ 1,939,000        
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       $ 6,861,000    
Shares withheld for tax withholding obligation (in shares)     3,082,607 1,008,319    
Deferred compensation arrangement with individual, shares issued, gross (in shares)     759,624 3,340,904    
Common Stock            
Class of Stock [Line Items]            
Stock repurchased during period (in shares) 549,834 258,103        
Shares exercised (in shares) 3,506,103 2,979,031        
Profit-sharing plan shares, net, value $ 5,000 $ 3,000        
Deferred Compensation, Share-based Payments [Member] | Deferred Profit Sharing            
Class of Stock [Line Items]            
Stock repurchased during period (in shares) 549,834 258,103 318,203 465,979    
Profit-sharing plan shares, net, value $ 6,970,000 $ 1,939,000 $ 2,417,000 $ 3,387,000    
Stock Option            
Class of Stock [Line Items]            
Stock repurchased during period (in shares)     1,516,616 913,608    
Shares exercised (in shares)     4,731,158 3,738,182    
Share-based compensation tax withholding payment     $ 2,324,000      
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 $ 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 2,322,983 2,332,585    
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 3,214,542 2,812,998    
Shares exercised (in shares)   4,372,294 4,731,158 3,726,606    
Shares issued for cash (in shares)   1,125,506        
Shares withheld for cost of options and tax withholding obligation   1,393,263 1,273,271 1,235,204    
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   $ 2,187,000    
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) 4,574,567 791,873 791,873 5,151,019    
Stock repurchased during period (in shares)   622,873 622,873 2,139,466    
Sale of stock, consideration received $ 58,349,000 $ 4,510,000 $ 4,510,000 $ 16,220,000    
Private Placement, Direct Investor Investment | Class B Common Stock            
Class of Stock [Line Items]            
Number of shares sold (in shares) 805,053 169,000 169,000 3,011,553    
Sale of stock, consideration received $ 12,462,000 $ 1,224,000 $ 1,224,000 $ 22,792,000