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DEBT - Schedule of Debt Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Less current portion $ 14,517 $ 10,762
Long-term portion 283,721 $ 287,353
Unsecured Debt | Senior Credit Facility, 2015    
Debt Instrument [Line Items]    
2016 11,250  
2017 15,000  
2018 20,625  
2019 28,125  
2020 225,000  
Total 300,000  
Less current portion 15,000  
Long-term portion $ 285,000