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SIGNIFICANT ACCOUNTING POLICIES: (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, plant and equipment:      
Depreciation expense $ 20,050 $ 19,925 $ 19,229
Carrying value of long-lived assets:      
Impairment charges of long-lived assets $ 0 $ 0 $ 0
Buildings | Minimum
     
Property, plant and equipment:      
Useful lives 20 years    
Buildings | Maximum
     
Property, plant and equipment:      
Useful lives 35 years    
Machinery and equipment | Minimum
     
Property, plant and equipment:      
Useful lives 5 years    
Machinery and equipment | Maximum
     
Property, plant and equipment:      
Useful lives 20 years