Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2020	$ 1,320,914	$ 17,851	$ 905,171	$ 423,940	$ (26,598)	$ 550
Net income	38,632	0	0	38,615	0	17
Amounts reported in other comprehensive loss	(26,632)	0	0	0	(26,630)	(2)
Dividends ($0.395 per share) ($0.415 per share)	(7,062)	0	0	(7,062)	0	0
Share issuance and equity-based compensation plans	3,601	24	3,577	0	0	0
Ending Balance at Mar. 31, 2021	1,329,453	17,875	908,748	455,493	(53,228)	565
Beginning Balance at Dec. 31, 2021	1,387,922	17,897	917,053	516,334	(63,990)	628
Net income	19,821	0	0	19,816	0	5
Amounts reported in other comprehensive loss	(6,270)	0	0	0	(6,271)	1
Dividends ($0.395 per share) ($0.415 per share)	(7,434)	0	0	(7,434)	0	0
Share issuance and equity-based compensation plans	1,661	15	1,646	0	0	0
Ending Balance at Mar. 31, 2022	$ 1,395,700	$ 17,912	$ 918,699	$ 528,716	$ (70,261)	$ 634