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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Long-term debt    
Total $ 353,224 $ 357,970
Less: current portion (66,712) (6,750)
Long-term debt 286,512 351,220
Term Loan B-1    
Long-term debt    
Total 289,512 291,476
Term Loan B-2    
Long-term debt    
Total $ 63,712 $ 66,494