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Stockholders' Equity:Shares and Dividends (Details) - $ / shares shares in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 27, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jul. 28, 2022
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.12 | $ 2.62 | $ 0.12 | $ 0.10 | $ 2.10 | $ 0.10 | $ 2.86 | $ 2.30 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Oct. 27, 2022 |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.15 |  |  |  |  |  |  |  |  |
Common Stock, Special Dividends, Per Share, Declared | $ 1.00 |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Dec. 15, 2022 |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Dec. 01, 2022 |  |  |  |  |  |  |  |  |
BC common stock repurchase program |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  |  | 1,500
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 2,000 |  |  |  |  |  | 2,000 |  |

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