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FINANCING ARRANGEMENTS: Sale and Leaseback Transaction (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Nov. 30, 2018
renewal_option
Debt Disclosure [Abstract]    
Term of contract   15 years
Number of renewal options | renewal_option   3
Renewal term   5 years
Lease period as a percent of economic life (more than)   75.00%
Short-term financial liability | $ $ 0.6