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Stockholders' Equity:Shares and Dividends (Details) - $ / shares
3 Months Ended
May 06, 2021
Mar. 31, 2021
Mar. 31, 2020
Subsequent Event [Line Items]      
Dividends declared per common share   $ 0.10 $ 0.10
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividends Payable, Date Declared May 06, 2021    
Dividends declared per common share $ 0.10    
Dividends Payable, Date to be Paid Jun. 15, 2021    
Dividends Payable, Date of Record Jun. 01, 2021