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Equity: At-the-Market Equity Offering Program (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Aug. 03, 2020
Jun. 30, 2020
At The Market Equity Offering Program Authorized Aggregate Value   $ 400,000 $ 300,000
Common Stock      
At The Market Equity Offering Program Shares Issued 1,328,332    
At The Market Equity Program Proceeds from Sale of Stock $ 99,000    
Payments of Stock Issuance Costs $ 1,200