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BANK LINE OF CREDIT (Details)
Dec. 31, 2016
USD ($)
Jul. 27, 2016
USD ($)
Jul. 05, 2012
USD ($)
banks
Line of Credit Facility [Line Items]      
Number of banks used for Credit Agreement | banks     2
Credit Agreement, maximum borrowing capacity   $ 75,000,000.0 $ 100,000,000.0
Line of credit, amount outstanding $ 0    
Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Credit Agreement, maximum borrowing capacity   $ 20,000,000.0 $ 20,000,000.0