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COMMITMENTS AND CONTINGENCIES (NARRATIVE) (DETAILS) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jun. 03, 2013
COMMITMENTS AND CONTINGENCIES [Abstract]        
Initial Borrowing Capacity       $ 700,000,000
Maximum Borrowing Capacity       1,000,000,000
Borrowings outstanding on credit facility 115,000,000   100,000,000  
Average daily utilization under credit facility 291,000,000 240,900,000    
Letters of credit issued under credit facility 3,500,000      
Remaining borrowing capacity under credit facility $ 581,500,000