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RETIREMENT PLANS: (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 64,335 $ 71,449 $ 70,132
Quoted Prices in Active Markets for Identical Assets - Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 53,683 60,732  
Significant Other Observable Inputs - Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,652 10,717  
Significant Observable Inputs - Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43,931 48,152  
Equity Securities | Quoted Prices in Active Markets for Identical Assets - Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43,931 48,152  
Equity Securities | Significant Other Observable Inputs - Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities | Significant Observable Inputs - Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,652 10,717  
Debt securities | Quoted Prices in Active Markets for Identical Assets - Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Debt securities | Significant Other Observable Inputs - Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,652 10,717  
Debt securities | Significant Observable Inputs - Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Investment Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9,752 12,580  
Investment Funds | Quoted Prices in Active Markets for Identical Assets - Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9,752 12,580  
Investment Funds | Significant Other Observable Inputs - Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Investment Funds | Significant Observable Inputs - Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0