TREASURY STOCK (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 11, 2018	Dec. 10, 2018	Dec. 31, 2016
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock outstanding (in shares)	2,900,000	2,900,000
Treasury stock, cost	$ 120,600,000	$ 121,600,000			$ 123,100,000
Treasury stock, price per share (in dollars per share)	$ 41.87	$ 41.77
Stock repurchase program, authorized amount (up to)			$ 225,000,000	$ 150,000,000
Stock repurchased during period (in shares)	0	0