CAPITAL STOCK (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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)	66,700,000
Common stock repurchased and retired	(623,000)	(512,000)
Balance at the end of the year (in shares)	67,300,000	66,700,000
Cash dividends paid on the common stock	$ 82,346	$ 79,944	$ 76,659
Common Stock Par Value
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	66,742,490	66,012,843
Restricted stock vestings (in shares)	39,691	67,708
Common stock repurchased and retired	(623,412)	(511,997)
Balance at the end of the year (in shares)	67,341,316	66,742,490	66,012,843
Common Stock Par Value | Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	1,182,547	1,173,936
Treasury Stock
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	4,881,889	3,865,863
Common stock repurchased (in shares)	45,000	1,411,017
Balance at the end of the year (in shares)	4,424,884	4,881,889	3,865,863
Treasury Stock | Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	(502,005)	(394,991)