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DEBT (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Apr. 07, 2015
Dec. 31, 2014
Line of Credit Facility      
Current portion $ (44,242)   $ (34,324)
Long-term debt 418,036   395,811
Secured Debt | $100 Million Term Loan Facility      
Line of Credit Facility      
Long-term debt 62,023   67,792
Maximum borrowing capacity 100,000   100,000
Secured Debt | $253 Million Term Loan Facility      
Line of Credit Facility      
Long-term debt 148,693   165,568
Maximum borrowing capacity 253,000   253,000
Secured Debt | $44 Million Term Loan Facility      
Line of Credit Facility      
Long-term debt 39,187   41,250
Maximum borrowing capacity 44,000   44,000
Secured Debt | $22 Million Term Loan Facility      
Line of Credit Facility      
Long-term debt 19,000   20,125
Maximum borrowing capacity 22,000   22,000
Secured Debt | 2014 Term Loan Facilities      
Line of Credit Facility      
Long-term debt 31,769   33,150
Revolving credit facility | 2015 Revolving Credit Facility      
Line of Credit Facility      
Long-term debt 35,000   0
Maximum borrowing capacity   $ 59,500  
Line of Credit facility | 2010 Credit Facility      
Line of Credit Facility      
Long-term debt     102,250
Line of Credit facility | $148 Million Credit Facility      
Line of Credit Facility      
Long-term debt 126,606   0
Maximum borrowing capacity $ 148,000   $ 148,000