EQUITY ROLL FORWARD (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Common Stock, Dividends, Per Share, Cash Paid	$ 0.195	$ 0.175
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	$ 948,662
Net income	30,119	$ 28,163
Equity, ending balance	964,059
Temporary equity, beginning balance	(19)	(245)
Net income	119	76
Temporary Equity, Foreign Currency Translation Adjustments	6	1
Temporary equity, ending balance	106	(168)
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	4,648	4,622
Stock Issued During Period, Value, New Issues	1	14
Stock Repurchased and Retired During Period, Value	(23)	(6)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	9	11
Equity, ending balance	4,635	4,641
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	310,617	283,420
Stock Issued During Period, Value, New Issues	342	5,069
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	3,976	4,179
Equity, ending balance	314,935	292,668
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	859,817	764,562
Net income	29,765	27,880
Dividends, Common Stock, Cash	(9,129)	(8,143)
Stock Repurchased and Retired During Period, Value	(19,297)	(4,843)
Equity, ending balance	861,156	779,456
Minimum Pension Liability
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(49,076)	(52,666)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	932	884
Equity, ending balance	(48,144)	(51,782)
Cumulative Translation Adjustment
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	(179,505)	(152,105)
Currency translation adjustment	8,630	(11,449)
Equity, ending balance	(170,875)	(163,554)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	2,161	2,116
Net income	235	207
Currency translation adjustment	(44)	(66)
Equity, ending balance	2,352	2,257
Total Equity
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance	948,662	849,949
Net income	30,000	28,087
Dividends, Common Stock, Cash	(9,129)	(8,143)
Stock Issued During Period, Value, New Issues	343	5,083
Stock Repurchased and Retired During Period, Value	(19,320)	(4,849)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	3,985	4,190
Currency translation adjustment	8,586	(11,515)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	932	884
Equity, ending balance	$ 964,059	$ 863,686