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Stockholders' Equity:Shares and Dividends (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 28, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Subsequent Event [Line Items]              
Dividends declared per common share   $ 2.62 $ 0.12 $ 2.10 $ 0.10 $ 2.74 $ 2.20
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Dividends Payable, Date Declared Jul. 28, 2022            
Dividends declared per common share $ 0.12            
Dividends Payable, Date to be Paid Sep. 15, 2022            
Dividends Payable, Date of Record Sep. 01, 2022            
Subsequent Event [Member] | BC common stock repurchase program              
Subsequent Event [Line Items]              
Stock Repurchase Program, Authorized Amount            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 1,500,000            
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 2,000,000