EQUITY ROLL FORWARD (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Common Stock, Dividends, Per Share, Cash Paid	$ 0.225	$ 0.195	$ 0.675	$ 0.585
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			$ 1,070,134
Net income	$ 58,168	$ 58,972	155,904	$ 148,854
Equity, ending balance	1,182,607		1,182,607
Temporary equity, beginning balance	901	284	620	(19)
Net income	136	168	417	457
Temporary Equity, Foreign Currency Translation Adjustments	(2)	3	(2)	17
Temporary equity, ending balance	1,035	455	1,035	455
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	4,626	4,628	4,619	4,648
Stock Issued During Period, Value, New Issues		4	22	8
Stock Repurchased and Retired During Period, Value	(6)	0	(33)	(38)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	1	0	13	14
Equity, ending balance	4,621	4,632	4,621	4,632
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	340,812	318,837	325,426	310,617
Stock Issued During Period, Value, New Issues		1,664	8,988	3,576
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,038	2,618	8,436	8,926
Equity, ending balance	342,850	323,119	342,850	323,119
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	1,020,883	900,135	969,261	859,817
Net income	57,798	58,624	154,723	147,753
Dividends, Common Stock, Cash	(10,443)	(9,088)	(31,315)	(27,293)
Stock Repurchased and Retired During Period, Value	(5,231)	(87)	(29,662)	(30,693)
Equity, ending balance	1,063,007	949,584	1,063,007	949,584
Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(219,662)	(237,513)	(231,448)	(228,581)
Currency translation adjustment	(10,775)	(15,924)	178	(26,712)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	385	1,277	1,218	3,133
Equity, ending balance	(230,052)	(252,160)	(230,052)	(252,160)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	2,842	2,486	2,276	2,161
Net income	234	180	764	644
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	821		821
Currency translation adjustment	(74)	(125)	(38)	(264)
Equity, ending balance	2,181	2,541	2,181	2,541
Total Equity
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	1,149,501	988,573	1,070,134	948,662
Net income	58,032	58,804	155,487	148,397
Dividends, Common Stock, Cash	(10,443)	(9,088)	(31,315)	(27,293)
Stock Issued During Period, Value, New Issues		1,668	9,010	3,584
Stock Repurchased and Retired During Period, Value	(5,237)	(87)	(29,695)	(30,731)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,039	2,618	8,449	8,940
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	821		821
Currency translation adjustment	(10,849)	(16,049)	140	(26,976)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	385	1,277	1,218	3,133
Equity, ending balance	$ 1,182,607	$ 1,027,716	$ 1,182,607	$ 1,027,716