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LOAN AND CREDIT LINES (Narrative) (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
item
Feb. 28, 2016
USD ($)
Jan. 01, 2016
USD ($)
Oct. 01, 2015
USD ($)
Apr. 01, 2015
USD ($)
Mar. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]                
Principal amount   $ 35,000            
Libor spread   3.15%            
Libor update period   3 months            
Accrued interest   $ 18           $ 38
Number of quarterly debt installments | item   17            
Maximum borrowing capacity under the credit agreement   $ 56,000            
Credit agreement, expiration date   Mar. 14, 2016            
Line of credit reduction   $ 56,000            
Line of credit outstanding amount   34,922            
Maturities principal amount   $ 2,072            
Libor [Member]                
Debt Instrument [Line Items]                
Libor spread   3.15%            
Maximum [Member] | Libor [Member]                
Debt Instrument [Line Items]                
Libor spread   3.40%            
Minimum [Member] | Libor [Member]                
Debt Instrument [Line Items]                
Libor spread   3.21%            
Line Of Credit [Member]                
Debt Instrument [Line Items]                
Credit agreement, expiration date Jun. 30, 2016              
Line of credit reduction     $ 50,000 $ 4,000 $ 5,000 $ 5,000    
Line of credit covenant, allowed discounting activities of the main Indian customer long-term receivables $ 54,000           $ 20,000  
Loan amount before start of gradual reduction 63,500              
Loan amount after reduction 50,000              
Minimum cash covenant before start of gradual reduction 20,000              
Minimum cash covenant after reduction 15,000              
Line of credit covenant, minimum total shareholders'' equity $ 85,000              
Line of credit covenant, reduction of the minimum total shareholders'' equity total assets ratio 0.27              
Line Of Credit [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Libor spread 3.50%              
Letter of Credit [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity under the credit agreement   $ 40,200