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SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Land $ 66,653 $ 46,219  
Buildings 421,722 335,885  
Machinery and equipment 776,436 706,938  
Property, Plant and Equipment, Gross 1,264,811 1,089,042  
Less accumulated depreciation 787,780 716,665  
Property, Plant and Equipment, Net $ 477,031 $ 372,377 $ 411,323
Machinery, tools and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of property, plant and equipment 3 years    
Machinery, tools and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of property, plant and equipment 20 years    
Buildings | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of property, plant and equipment 40 years