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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2020 | Apr. 29, 2020 | Jan. 29, 2020 | Jan. 16, 2020 | Dec. 31, 2019 | Mar. 28, 2020 | Mar. 30, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Repurchase of Common Stock |  |  |  |  |  |  |  |  |
Aggregate purchase price of shares repurchased (in dollars) |  |  |  |  |  | $ 48,987,500 | $ 24,028,100 |  |
Borrowing from Line of Credit for Tender Offer |  |  |  |  |  |  |  | $ 46,600,000 | $ 18,800,000
Dividends |  |  |  |  |  |  |  |  |
Cash dividends declared and paid (in dollars per share) | $ 0.25 | $ 0.05 | $ 0.25 |  |  |  |  |  |
2020 Tender Offer |  |  |  |  |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |  |  |  |  |
Shares authorized for repurchase per tender offer |  |  |  |  | 300,000 |  |  |  |
Price per share of common stock per tender offer |  |  |  |  | $ 163.00 |  |  |  |
Number of shares repurchased |  |  |  | 300,000 |  |  |  |  |
Purchase price of shares per tender offer |  |  |  | $ 49,000,000.0 |  |  |  |  |
Borrowing from Line of Credit for Tender Offer |  |  |  | $ 19,200,000 |  |  |  |  |
Common Stock Repurchase Program |  |  |  |  |  |  |  |  |
Repurchase of Common Stock |  |  |  |  |  |  |  |  |
Number of additional shares that can be repurchased |  |  |  |  |  |  |  | 130,604 |

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