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RETIREMENT PLANS: (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Service cost - benefits earned $ 1,388 $ 1,432 $ 1,882
Interest cost on projected benefit obligation 3,194 3,621 3,729
Expected return on plan assets (3,962) (3,940) (3,429)
Net amortization and deferral 1,448 1,205 1,936
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
Amortization of unrecognized gain (loss) (1,447) (1,204) (1,935)
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)