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Debt: Line of Credit (Details) - Line of Credit - CIBC Bank USA and BMO Harris Bank N.A. - USD ($)
$ in Millions
Sep. 30, 2017
Jul. 31, 2017
Line of Credit    
Terms notes, available borrowing to fund Tender Offer   $ 15.0
Borrowings outstanding $ 41.9  
Line of credit available for additional borrowings $ 8.1  
Minimum    
Line of Credit    
Interest rate (as a percent) 3.23%  
Maximum    
Line of Credit    
Interest rate (as a percent) 4.25%