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Related Party Transactions (Narrative) (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 23, 2021 | Mar. 27, 2021 | Mar. 19, 2021
Related Party Transaction [Line Items] |  |  |
Aggregate purchase price of the stock repurchased |  | $ 79,998,588 |
Short-term non-interest bearing loans outstanding to investment/profit sharing plan |  | $ 400,000 |
Common Stock [Member] | Share Repurchase Program [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Shares repurchased during the period | 1,300,000 |  |
Aggregate purchase price of the stock repurchased | $ 80,000,000.0 |  |
Common Stock [Member] | Share Repurchase Program [Member] | Maximum [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Aggregate number of shares authorized for repurchase |  |  | 2,000,000.0
Common Stock [Member] | Class B Common Stock [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Shares repurchased during the period |  | 1,265,400 |
Aggregate purchase price of the stock repurchased |  | $ 63,270 |

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