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LONG-TERM DEBT: Maturities of Long-term Debt Level 4 (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two 0
Long-term Debt, Maturities, Repayments of Principal in Year Three 230,000
Long-term Debt, Maturities, Repayments of Principal in Year Four 0
Long-term Debt, Maturities, Repayments of Principal in Year Five 75,000
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 1,460,345