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Common Stock - Sales, Repurchases, and Issuances of Company Capital Stock Narrative (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Apr. 23, 2018 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Profit-sharing plan shares, net, value |  | $ 1,850,000 |  |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares exercised (in shares) | 1,263,121 | 697,833 |  |  |
Stock repurchased during period (in shares) |  | 186,715 |  |  |
Profit-sharing plan shares, net, value |  | $ 2,000 |  |  |
Deferred Compensation, Share-based Payments | Deferred Profit Sharing |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock repurchased during period (in shares) |  | 186,715 |  |  |
Profit-sharing plan shares, net, value |  | $ 1,850,000 |  |  |
Performance Based Restricted Stock Units (RSUs), 2016 | Equity Incentive Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased by Company after exercise |  | $ 302,000 |  |  |
Shares repurchased by Company after exercise (in shares) |  | 37,870 |  |  |
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Amount authorized for purchase |  |  | $ 250,000,000 | $ 250,000,000 | $ 200,000,000
Class B Common Stock | Private Placement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) | 0 |  |  |  |
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 | $ 8,859,000 | $ 301,000 |  |  |
Deferred compensation arrangement with individual, shares issued (in shares) | 339,503 | 683,072 |  |  |
Deferred compensation arrangement with individual, shares issued, gross (in shares) | 556,475 | 720,827 |  |  |
Shares withheld for tax withholding obligation (in shares) | 216,972 | 37,755 |  |  |
Class B Common Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares exercised, net of shares withheld (in shares) |  | 697,833 |  |  |
Shares withheld for cost of options and tax withholding obligation |  | 561,667 |  |  |
Class B Common Stock | Bonus Plan Incentive |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares exercised, net of shares withheld (in shares) | 79,961 |  |  |  |
Shares withheld for cost of options and tax withholding obligation | 46,077 |  |  |  |
Share-based compensation tax withholding payment | $ 2,037,000 |  |  |  |
Shares exercised (in shares) | 126,038 |  |  |  |
Class B Common Stock | Stock Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares exercised, net of shares withheld (in shares) | 1,263,121 |  |  |  |
Shares withheld for cost of options and tax withholding obligation | 262,210 |  |  |  |
Share-based compensation tax withholding payment | $ 7,158,000 | $ 1,341,000 |  |  |
Cash used to settle award | $ 1,751,000 |  |  |  |
Class B Common Stock | Stock Option | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash used to settle award |  | $ 724,000 |  |  |

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