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Stockholders' Equity:Shares and Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsequent Event [Line Items]              
Dividends declared per common share   $ 0.10 $ 0.10 $ 0.09 $ 0.09 $ 0.20 $ 0.18
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Dividends Payable, Date Declared Jul. 30, 2020            
Dividends declared per common share $ 0.10            
Dividends Payable, Date to be Paid Sep. 15, 2020            
Dividends Payable, Date of Record Sep. 01, 2020