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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 |  |  |  |  |  |

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