Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period			$ 783,171
Balance at the end of the period	$ 803,874	$ 783,601	803,874	$ 783,601
Foreign Currency Translation
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(21,357)	(24,419)	(23,795)	(24,882)
Other comprehensive earnings (loss) before reclassifications	(543)	120	1,895	583
Other comprehensive earnings (loss) net of tax	(543)	120	1,895	583
Balance at the end of the period	(21,900)	(24,299)	(21,900)	(24,299)
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(7,166)	(7,575)	(8,809)	(1,286)
Other comprehensive earnings (loss) before reclassifications	567	(2,518)	2,210	(8,799)
Reclassifications from accumulated other comprehensive loss		(3)		(11)
Other comprehensive earnings (loss) net of tax	567	(2,521)	2,210	(8,810)
Balance at the end of the period	(6,599)	(10,096)	(6,599)	(10,096)
Foreign Currency Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	79	124	(215)	322
Other comprehensive earnings (loss) before reclassifications	(209)	(365)	(17)	(421)
Reclassifications from accumulated other comprehensive loss	22	(37)	124	(179)
Other comprehensive earnings (loss) net of tax	(187)	(402)	107	(600)
Balance at the end of the period	(108)	(278)	(108)	(278)
Commodity Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(609)	76	8	94
Other comprehensive earnings (loss) before reclassifications	1,783	(45)	1,236	5
Reclassifications from accumulated other comprehensive loss	4	(55)	(66)	(123)
Other comprehensive earnings (loss) net of tax	1,787	(100)	1,170	(118)
Balance at the end of the period	1,178	(24)	1,178	(24)
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	2,355	426	2,642	739
Reclassifications from accumulated other comprehensive loss	(144)	(157)	(431)	(470)
Other comprehensive earnings (loss) net of tax	(144)	(157)	(431)	(470)
Balance at the end of the period	2,211	269	2,211	269
Accumulated Other Comprehensive Earnings (Loss).
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(26,698)	(31,368)	(30,169)	(25,013)
Other comprehensive earnings (loss) before reclassifications	1,598	(2,808)	5,324	(8,632)
Reclassifications from accumulated other comprehensive loss	(118)	(252)	(373)	(783)
Other comprehensive earnings (loss) net of tax	1,480	(3,060)	4,951	(9,415)
Balance at the end of the period	$ (25,218)	$ (34,428)	$ (25,218)	$ (34,428)