INDEBTEDNESS (NARRATIVE) (DETAILS) - USD ($)	Dec. 31, 2016	Feb. 11, 2016	Dec. 31, 2015
INDEBTEDNESS [ABSTRACT]
Initiation date of current line of credit agreement		Feb. 11, 2016
Line of Credit Facility, Expiration Date		Feb. 11, 2021
Initial Borrowing Capacity		$ 900,000,000.0
Maximum borrowing capacity		$ 1,200,000,000
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 our net leverage ratio. Eurodollar loans bear interest at LIBOR plus a margin of 1.0% to 1.75% based on our net leverage ratio. Alternate currency loans bear interest at rates applicable to their respective currencies.
Line of Credit Facility, Commitment Fee Description		The Credit Facility commitment fees are payable to the lenders in an amount equal to the unused portion of the Credit Facility at a rate of 0.125% to 0.250% based on our net leverage ratio.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.
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.
Borrowings outstanding on credit facility	$ 217,300,000		$ 100,000,000
Average daily utilization under credit facility	375,300,000		$ 319,600,000
Letters of credit issued under credit facility	3,900,000
Remaining borrowing capacity under credit facility	370,000,000
Letters Of Credit Issued Outside Line Of Credit Facility	$ 6,600,000