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Summary of Significant Accounting Policies:Leases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]          
Rental expense $ 4.6 $ 4.8 $ 13.8 $ 14.4  
Other Noncurrent Liabilities [Member]          
Capital Leased Assets [Line Items]          
Capital Lease Obligations, Noncurrent $ 22.1   22.1   $ 3.9
Building [Member]          
Capital Leased Assets [Line Items]          
Capital Lease Obligations Incurred     $ 18.9    
Capital Lease 1 [Member] | Building [Member]          
Capital Leased Assets [Line Items]          
Lessee, Capital Lease, Term of Contract     13 years    
Capital Lease 2 [Member] | Building [Member]          
Capital Leased Assets [Line Items]          
Lessee, Capital Lease, Term of Contract     20 years