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COMMITMENTS AND CONTINGENCIES (NARRATIVE) (DETAILS) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
INDEBTEDNESS [ABSTRACT]      
Initial Borrowing Capacity $ 900,000    
Maximum borrowing capacity $ 1,200,000    
Line of Credit Facility, Interest Rate Description Base rate loans bear interest at a rate equal to the greatest of (i) Wells Fargo's prime rate, (ii) one half of 1% in excess of the federal funds effective rate, and (iii) 1.25% in excess of the one month London Interbank Offered Rate ("LIBOR"); plus in each case a margin of 0% to 0.75 based on the Company's net leverage ratio. Eurodollar loans bear interest at LIBOR plus a margin of 1.0% to 1.75% based on the Company's net leverage ratio. Alternate currency loans bear interest at rates applicable to their respective currencies.    
Description of line of credit agreement The Credit Agreement provides for a secured revolving credit facility that matures on February 11, 2021 with an initial maximum aggregate commitment of $900.0 million, and an accordion feature of up to $1.2 billion in the aggregate, if certain conditions are satisfied.    
Line of Credit Facility, Collateral The Company is obligated to maintain a maximum net leverage ratio of 3.25 to 1.00, and a minimum Interest Coverage Ratio of 2.50 to 1.00.    
Borrowings outstanding on credit facility $ 135,000   $ 100,000
Average daily utilization under credit facility 342,200 $ 323,500  
Letters of credit issued under credit facility 3,400    
Remaining borrowing capacity under credit facility 420,000    
Letters Of Credit Issued Outside Line Of Credit Facility $ 5,400