Condensed Consolidated Statements of Changes in Equity - USD ($)	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	$ 1,320,914,000	$ 17,851,000	$ 905,171,000	$ 423,940,000	$ (26,598,000)	$ 550,000
Net income	38,632,000	0	0	38,615,000	0	17,000
Amounts reported in other comprehensive loss	(26,632,000)	0	0	0	(26,630,000)	(2,000)
Dividends ($0.395 per share) ($0.415 per share)	(7,062,000)	0	0	(7,062,000)	0	0
Share issuance and equity-based compensation plans	3,601,000	24,000	3,577,000	0	0	0
Ending Balance at Mar. 31, 2021	1,329,453,000	17,875,000	908,748,000	455,493,000	(53,228,000)	565,000
Beginning Balance at Dec. 31, 2020	1,320,914,000	17,851,000	905,171,000	423,940,000	(26,598,000)	550,000
Net income	103,305,000
Amounts reported in other comprehensive loss	(28,119,000)
Ending Balance at Sep. 30, 2021	1,383,696,000	17,889,000	914,277,000	505,635,000	(54,723,000)	618,000
Beginning Balance at Mar. 31, 2021	1,329,453,000	17,875,000	908,748,000	455,493,000	(53,228,000)	565,000
Net income	33,600,000	0	0	33,570,000	0	30,000
Amounts reported in other comprehensive loss	17,293,000	0	0	0	17,285,000	8,000
Dividends ($0.395 per share) ($0.415 per share)	(7,062,000)	0	0	(7,062,000)	0	0
Share issuance and equity-based compensation plans	2,117,000	3,000	2,114,000	0	0	0
Ending Balance at Jun. 30, 2021	1,375,401,000	17,878,000	910,862,000	482,001,000	(35,943,000)	603,000
Net income	31,073,000	0	0	31,058,000	0	15,000
Amounts reported in other comprehensive loss	(18,780,000)	0	0	0	(18,780,000)	0
Dividends ($0.395 per share) ($0.415 per share)	(7,424,000)	0	0	(7,424,000)	0	0
Share issuance and equity-based compensation plans	3,426,000	11,000	3,415,000	0	0	0
Ending Balance at Sep. 30, 2021	1,383,696,000	17,889,000	914,277,000	505,635,000	(54,723,000)	618,000
Beginning Balance at Dec. 31, 2021	1,387,922,000	17,897,000	917,053,000	516,334,000	(63,990,000)	628,000
Net income	19,821,000	0	0	19,816,000	0	5,000
Amounts reported in other comprehensive loss	(6,270,000)	0	0	0	(6,271,000)	1,000
Dividends ($0.395 per share) ($0.415 per share)	(7,434,000)	0	0	(7,434,000)	0	0
Share issuance and equity-based compensation plans	1,661,000	15,000	1,646,000	0	0	0
Ending Balance at Mar. 31, 2022	1,395,700,000	17,912,000	918,699,000	528,716,000	(70,261,000)	634,000
Beginning Balance at Dec. 31, 2021	1,387,922,000	17,897,000	917,053,000	516,334,000	(63,990,000)	628,000
Net income	60,100,000
Amounts reported in other comprehensive loss	(153,734,000)
Ending Balance at Sep. 30, 2022	1,279,630,000	17,931,000	925,037,000	553,685,000	(217,655,000)	632,000
Beginning Balance at Mar. 31, 2022	1,395,700,000	17,912,000	918,699,000	528,716,000	(70,261,000)	634,000
Net income	14,371,000	0	0	14,343,000	0	28,000
Amounts reported in other comprehensive loss	(75,018,000)	0	0	0	(74,985,000)	(33,000)
Dividends ($0.395 per share) ($0.415 per share)	(7,438,000)	0	0	(7,438,000)	0	0
Share issuance and equity-based compensation plans	2,951,000	8,000	2,943,000	0	0	0
Ending Balance at Jun. 30, 2022	1,330,566,000	17,920,000	921,642,000	535,621,000	(145,246,000)	629,000
Net income	25,908,000	0	0	25,867,000	0	41,000
Amounts reported in other comprehensive loss	(72,447,000)	0	0	0	(72,409,000)	(38,000)
Dividends ($0.395 per share) ($0.415 per share)	(7,803,000)	0	0	(7,803,000)	0	0
Share issuance and equity-based compensation plans	3,406,000	11,000	3,395,000	0	0	0
Ending Balance at Sep. 30, 2022	$ 1,279,630,000	$ 17,931,000	$ 925,037,000	$ 553,685,000	$ (217,655,000)	$ 632,000