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Common Stock (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 25, 2020
Apr. 23, 2018
Apr. 20, 2018
Sep. 30, 2016
Profit-sharing plan shares, net, value $ 6,970,000 $ 1,939,000            
Value of shares issued for cash     $ 418,000 $ (9,673,000)        
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits                
Share-based compensation tax withholding payment       $ 6,861,000        
Income tax withholdings on shares sold back     $ 5,609,000          
Deferred compensation arrangement with individual, shares issued, gross (in shares)     759,624 3,340,904        
Shares sold     3,082,607 1,008,319        
Stock Option                
Stock repurchased during period (in shares)     1,516,616 913,608        
Stock option exercises, net (in shares)     4,731,158 3,738,182        
Share-based compensation tax withholding payment     $ 2,324,000          
Issuance of shares for options, other than cash     3,457,887 2,491,402        
Income tax withholdings on shares sold back       $ 1,577,000        
Equity Incentive Plan | Performance Based Restricted Stock Units Rsus Two Thousand Sixteen [Member]                
Shares repurchased by Company after exercise     $ 8,838,000 $ 8,571,000        
Shares repurchased by Company after exercise (in shares)     1,126,747          
Private Placement                
Value of shares issued for cash $ (57,000) $ 420,000            
Common Stock                
Outstanding shares 262,227,036 255,077,438 254,842,949 250,283,513        
Stock repurchased during period (in shares) 549,834 258,103            
Profit-sharing plan shares, net, value $ 5,000 $ 3,000            
Stock option exercises, net (in shares) 3,506,103 2,979,031            
Common Stock | Private Placement                
Value of shares issued for cash   $ 1,000            
Deferred Compensation, Share-based Payments [Member] | Deferred Profit Sharing                
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        
Class A and Class B Common Stock                
Stock option exercises, net (in shares)     3,214,542 2,812,998        
Value of shares issued for cash       $ (13,000)        
Class A and Class B Common Stock | Equity Incentive Plan | Performance Based Restricted Stock Units Rsus Two Thousand Sixteen [Member]                
Shares repurchased by Company after exercise (in shares)       1,131,928        
Class A Common Stock                
Common stock shares authorized (up to) (in shares) 100,000,000   320,000,000 320,000,000 100,000,000   320,000,000  
Outstanding shares 11,601,757   11,601,757 11,601,757        
Class B Common Stock                
Common stock shares authorized (up to) (in shares) 1,800,000,000   600,000,000 600,000,000 1,800,000,000   600,000,000  
Outstanding shares 250,625,279   243,241,192 238,681,756        
Common Stock Purchase Agreement, Amount Authorized $ 250,000,000         $ 250,000,000   $ 200,000,000
Stock repurchased during period (in shares) 3,769,345              
Number of each Class B common stock converted     1.00%          
Class B Common Stock | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits                
Share-based compensation tax withholding payment $ 1,877,000 $ 4,972,000            
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            
Shares sold 181,228 679,806            
Class B Common Stock | Stock Option                
Shares exercised, net of shares withheld (in shares) 3,506,103              
Stock option exercises, net (in shares) 4,864,944              
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        
Share-based Payment Arrangement, Cash Used to Settle Award $ 7,776,000              
Class B Common Stock | Private Placement                
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        
Class B Common Stock | Private Placement, Direct Investor Investment                
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        
Class B Common Stock | Common Stock                
Shares exercised, net of shares withheld (in shares)   2,979,031 3,214,542 2,812,998        
Stock option exercises, net (in shares)   4,372,294 4,731,158 3,726,606        
Shares withheld for cost of options and tax withholding obligation   1,393,263 1,273,271 1,235,204        
Value of shares issued for cash     $ 3,627,000          
Class B Common Stock | Common Stock | Stock Option                
Share-based Payment Arrangement, Cash Used to Settle Award   $ 3,054,000