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FAIR VALUE (Details 2) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents $ 150,147 $ 176,589 $ 161,361 $ 130,429
Change in the fair value of acquisition related contingent consideration (7,302) $ (37,924)    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 150,147   161,361  
Restricted cash 4,801   3,022  
Long-term debt 0   0  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 0   0  
Restricted cash 0   0  
Long-term debt 498,475   467,319  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 0   0  
Restricted cash 0   0  
Long-term debt 0   0  
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 150,147   161,361  
Restricted cash 4,801   3,022  
Long-term debt $ 560,084   $ 591,543