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FAIR VALUE (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents $ 120,486 $ 179,327 $ 130,079 $ 161,361
Restricted cash, carrying amount 4,781 4,801    
Long-term debt, carrying amount 482,626 536,598    
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 120,486 179,327    
Restricted cash, fair value 4,781 4,801    
Long-term debt, fair value 0 0    
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 0 0    
Restricted cash, fair value 0 0    
Long-term debt, fair value $ 412,645 $ 469,523