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PROPERTY AND EQUIPMENT, NET (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Impairment loss of property and equipment, net   $ 4,106  
Depreciation expenses $ 7,337 9,256 $ 10,091
Depreciable cost 80,837 81,963  
Reduction to fully depreciated equipment and leasehold improvements that are no longer in use 33,299    
Assets under capital leases [Member]      
Property, Plant and Equipment [Line Items]      
Depreciable cost 1,121 1,121  
Accumulated depreciation $ 559 334  
Equipment Leased To Others [Member]      
Property, Plant and Equipment [Line Items]      
Impairment loss of property and equipment, net   4,030  
Computers, software and electronic equipment [Member]      
Property, Plant and Equipment [Line Items]      
Impairment loss of property and equipment, net   $ 76