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REVOLVING FACILITY AND DEFERRED FINANCING COSTS (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 20, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Deferred financing costs and other long term assets $ 2,817,000   $ 2,416,000
Revolving Facility [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis LIBOR    
Borrowings required leverage ratio 3.50    
Borrowings required leverage ratio under permitted acquisition 4.00    
Borrowing covenants tangible net worth threshold $ 136,800,000    
Borrowings convenants positive net income percentage per quarter 50.00%    
Borrowings $ 0    
Deferred financing costs and other long term assets $ 2,300,000   $ 1,900,000
Revolving Facility [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 2.50%    
Revolving Facility [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 3.50%    
Revolving Facility [member] | Floating interest rate [member]      
Disclosure of detailed information about borrowings [line items]      
Undrawn borrowing facilities   $ 150,000,000  
Revolving Facility [member] | Floating interest rate [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings standby fee percentage 0.60%    
Revolving Facility [member] | Floating interest rate [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings standby fee percentage 0.80%