COMMITMENTS AND CONTINGENCIES (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 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	$ 129,000		$ 100,000
Average daily utilization under credit facility	359,500	$ 323,000
Letters of credit issued under credit facility	3,400
Remaining borrowing capacity under credit facility	425,000
Letters Of Credit Issued Outside Line Of Credit Facility	$ 5,500