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Equity: At-the-Market Equity Offering Program (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Aug. 03, 2020
At The Market Equity Offering Program Authorized Aggregate Value $ 300,000          
Issuance costs $ 79 $ 967 $ 492 $ 289    
Subsequent Event            
At The Market Equity Offering Program Authorized Aggregate Value           $ 400,000
Common Stock            
At The Market Equity Offering Program Shares Issued     700,000   900,000  
At The Market Equity Program Proceeds from Sale of Stock     $ 49,000   $ 69,000  
Issuance costs     $ 500   $ 700