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COMMITMENTS AND CONTINGENCIES (NARRATIVE) (DETAILS) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jun. 03, 2013
COMMITMENTS AND CONTINGENCIES [Abstract]        
Initial Borrowing Capacity       $ 700,000
Maximum Borrowing Capacity       $ 1,000,000
Borrowings outstanding on credit facility $ 115,000   $ 100,000  
Average daily utilization under credit facility 323,500 $ 280,500    
Letters of credit issued under credit facility 3,200      
Remaining borrowing capacity under credit facility 385,000      
Letters of credit issued outside credit facility $ 5,600