CAPITAL STOCK (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common stock and treasury stock and the share activity
Authorized common stock (in shares)	199,000,000	199,000,000
Balance at the beginning of the year (in shares)	67,300,000
Common stock repurchased and retired		(623,000)
Balance at the end of the year (in shares)	68,600,000	67,300,000
Cash dividends paid on the common stock	$ 90,208	$ 82,346	$ 79,944
Common Stock Par Value
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	67,341,316	66,742,490
Restricted stock vestings (in shares)	41,268	39,691
Common stock repurchased and retired		(623,412)
Balance at the end of the year (in shares)	68,608,508	67,341,316	66,742,490
Common Stock Par Value | Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	1,079,841	1,182,547
Common Stock Par Value | Director Stock Option Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	146,083
Treasury Stock
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	4,424,884	4,881,889
Common stock repurchased (in shares)	778,848	45,000
Balance at the end of the year (in shares)	4,836,027	4,424,884	4,881,889
Treasury Stock | Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	(367,705)	(502,005)