CAPITAL STOCK (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common stock and treasury stock and the share activity
Authorized common stock (in shares)		199,000,000
Balance at the beginning of the year (in shares)		86,300,000
Common stock repurchases (in shares)			4,500,000
Stock retirements	(20,000,000)
Balance at the end of the year (in shares)		66,700,000	86,300,000
Cash dividends paid on the common stock		$ 71,247	$ 71,072	$ 66,133
Common Stock
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)		86,267,467	85,364,303
Restricted stock vestings (in shares)		13,331	9,924
Common stock repurchased and retired		(190,350)
Stock retirements		(20,718,866)
Balance at the end of the year (in shares)		66,685,378	86,267,467	85,364,303
Common Stock | Stock Option Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)		1,248,629	851,396
Common Stock | Director Stock Option Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)		65,167	41,844
Treasury Stock
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)		24,336,367	19,979,833
Common stock repurchases (in shares)		718,866	4,533,814
Stock retirements		(20,718,866)
Balance at the end of the year (in shares)		4,168,489	24,336,367	19,979,833
Treasury Stock | Stock Option Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)		(167,878)	(177,280)