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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Oct. 26, 2012
Debt Instrument [Line Items]      
Outstanding amount [1] $ 380,213 $ 324,568  
2012 Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 500,000   $ 430,000
Maturity date Dec. 31, 2020    
Deferred financing costs   4,600  
Outstanding amount $ 385,000 $ 330,000  
[1] Long-term Debt consists of outstanding amounts on our Credit Facility less unamortized deferred financing cost. Outstanding amounts on our Credit Facility were 385,000 and 330,000 as of June 30, 2016 and December 31, 2015, respectively. Please see note 2 to these Condensed Consolidated Financial Statements describing the effects of the accounting principle change covering the deferred financing costs.