SHARE CAPITAL AND CAPITAL IN EXCESS OF PAR VALUE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in share capital and capital in excess of par value
Balance at the beginning of the period	$ 823,107
Balance at the beginning of the period (in shares)	102
Balance at the end of the period	$ 870,409	$ 823,107
Balance at the end of the period (in shares)	105	102
Total Number of Shares Purchased	448	928	818
Average Price Paid Per Share (in dollars per share)	$ 30.16	$ 35.66	$ 38.98
Stock dividends (as a percent)	3.00%	3.00%	3.00%
Common Stock
Changes in share capital and capital in excess of par value
Balance at the beginning of the period	$ 27,777	$ 27,584	$ 27,322
Balance at the beginning of the period (in shares)	39,999	39,721	39,344
Issuance of 3% stock dividend	$ 830	$ 823	$ 817
Issuance of 3% stock dividend (in shares)	1,196	1,185	1,176
Conversion of Class B common shares to common shares	$ 29	$ 14	$ 13
Conversion of Class B common shares to common shares (in shares)	42	20	19
Purchase and retirement of common shares and other	$ (311)	$ (644)	$ (568)
Purchase and retirement of common shares and other (in shares)	(448)	(927)	(818)
Balance at the end of the period	$ 28,325	$ 27,777	$ 27,584
Balance at the end of the period (in shares)	40,789	39,999	39,721
Treasury Stock
Changes in share capital and capital in excess of par value
Balance at the beginning of the period	$ (1,992)	$ (1,992)	$ (1,992)
Balance at the beginning of the period (in shares)	102	99	96
Issuance of 3% stock dividend (in shares)	3	3	3
Balance at the end of the period	$ (1,992)	$ (1,992)	$ (1,992)
Balance at the end of the period (in shares)	105	102	99
Capital in Excess of Par Value
Changes in share capital and capital in excess of par value
Balance at the beginning of the period	$ 737,453	$ 719,606	$ 709,880
Issuance of 3% stock dividend	64,800	50,649	41,068
Purchase and retirement of common shares and other	(13,359)	(32,802)	(31,342)
Balance at the end of the period	788,894	737,453	719,606
Class B Common Stock | Common Stock
Changes in share capital and capital in excess of par value
Balance at the beginning of the period	$ 20,448	$ 19,866	$ 19,300
Balance at the beginning of the period (in shares)	29,445	28,607	27,793
Issuance of 3% stock dividend	$ 613	$ 596	$ 579
Issuance of 3% stock dividend (in shares)	883	858	833
Conversion of Class B common shares to common shares	$ (29)	$ (14)	$ (13)
Conversion of Class B common shares to common shares (in shares)	(42)	(20)	(19)
Balance at the end of the period	$ 21,032	$ 20,448	$ 19,866
Balance at the end of the period (in shares)	30,286	29,445	28,607