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FAIR VALUE (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents $ 159,705 $ 179,327 $ 105,623 $ 161,361
Restricted cash 4,780 4,801    
Long-term Debt, Gross 535,112 536,598    
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Cash and cash equivalents 159,705 179,327    
Restricted cash 4,780 4,801    
Long-term debt 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 0 0    
Long-term debt $ 476,250 $ 469,523