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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 |  |

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