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Stockholders' Equity:Shares and Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 27, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Subsequent Event [Line Items]              
Dividends declared per common share   $ 3.15 $ 0.15 $ 2.62 $ 0.12 $ 3.30 $ 2.74
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Dividends Payable, Date Declared Jul. 27, 2023            
Dividends declared per common share $ 0.20            
Dividends Payable, Date to be Paid Sep. 15, 2023            
Dividends Payable, Date of Record Sep. 01, 2023