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RETIREMENT PLANS: (Details 11) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,388 $ 1,432 $ 1,882
Interest cost 3,194 3,621 3,729
Recognized actuarial loss (10,618) 5,305  
Net periodic pension cost 2,068 2,318 4,118
Net loss (gain) during the period (1,192) 5,366 (6,150)
Amortization of prior service cost (1) (1) (1)
Total recognized in other comprehensive income (loss) (2,640) 4,161 (8,086)
Total recognized net periodic pension cost and other comprehensive income (572) 6,479 (3,968)
Postretirement Health Coverage [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 42 53 55
Interest cost 131 172 186
Net periodic pension cost 173 225 241
Net loss (gain) during the period (872) 83 (144)
Total recognized in other comprehensive income (loss) (872) 83 (144)
Total recognized net periodic pension cost and other comprehensive income $ (699) $ 308 $ 97