EQUITY ROLL FORWARD (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Common Stock, Dividends, Per Share, Cash Paid	$ 0.195	$ 0.175	$ 0.585	$ 0.525
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			$ 948,662
Net income	$ 58,972	$ 46,454	148,854	$ 113,980
Equity, ending balance	1,027,716		1,027,716
Temporary equity, beginning balance	284	(209)	(19)	(245)
Net income	168	64	457	92
Temporary Equity, Foreign Currency Translation Adjustments	3	(1)	17	7
Temporary equity, ending balance	455	(146)	455	(146)
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	4,628	4,645	4,648	4,622
Stock Issued During Period, Value, New Issues	4	7	8	33
Stock Repurchased and Retired During Period, Value	0	(12)	(38)	(27)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	0	1	14	13
Equity, ending balance	4,632	4,641	4,632	4,641
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	318,837	298,944	310,617	283,420
Stock Issued During Period, Value, New Issues	1,664	2,394	3,576	11,357
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,618	2,347	8,926	8,908
Equity, ending balance	323,119	303,685	323,119	303,685
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	900,135	804,047	859,817	764,562
Net income	58,624	46,172	147,753	113,193
Dividends, Common Stock, Cash	(9,088)	(8,179)	(27,293)	(24,499)
Stock Repurchased and Retired During Period, Value	(87)	(9,895)	(30,693)	(21,111)
Equity, ending balance	949,584	832,145	949,584	832,145
Minimum Pension Liability
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(47,220)	(50,897)	(49,076)	(52,666)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,277	915	3,133	2,684
Equity, ending balance	(45,943)	(49,982)	(45,943)	(49,982)
Cumulative Translation Adjustment
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(190,293)	(155,440)	(179,505)	(152,105)
Currency translation adjustment	(15,924)	(12,034)	(26,712)	(15,369)
Equity, ending balance	(206,217)	(167,474)	(206,217)	(167,474)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	2,486	2,541	2,161	2,116
Net income	180	218	644	695
Currency translation adjustment	(125)	(50)	(264)	(102)
Equity, ending balance	2,541	2,709	2,541	2,709
Total Equity
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	988,573	903,840	948,662	849,949
Net income	58,804	46,390	148,397	113,888
Dividends, Common Stock, Cash	(9,088)	(8,179)	(27,293)	(24,499)
Stock Issued During Period, Value, New Issues	1,668	2,401	3,584	11,390
Stock Repurchased and Retired During Period, Value	(87)	(9,907)	(30,731)	(21,138)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,618	2,348	8,940	8,921
Currency translation adjustment	(16,049)	(12,084)	(26,976)	(15,471)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,277	915	3,133	2,684
Equity, ending balance	$ 1,027,716	$ 925,724	$ 1,027,716	$ 925,724