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FAIR VALUE MEASUREMENTS (Details) - Estimated fair value - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Level 2    
FAIR VALUE MEASUREMENTS    
Long-term debt $ 667,425 $ 819,099
Total 667,425 819,099
Level 3    
FAIR VALUE MEASUREMENTS    
Total 7,000 10,400
Level 3 | Recurring    
FAIR VALUE MEASUREMENTS    
Contingent consideration $ 7,000 $ 10,400