Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period			$ 870,743
Balance at the end of the period	$ 918,850	$ 870,161	918,850	$ 870,161
Foreign Currency Translation
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(23,405)	(22,739)	(24,787)	(21,050)
Other comprehensive earnings (loss) before reclassifications	531	(1,370)	1,913	(3,059)
Other comprehensive earnings (loss) net of tax	531	(1,370)	1,913	(3,059)
Balance at the end of the period	(22,874)	(24,109)	(22,874)	(24,109)
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	4,552	(1,615)	1,184	(2,359)
Other comprehensive earnings (loss) before reclassifications	(3,375)	4,904	39	5,650
Reclassifications from accumulated other comprehensive loss		(4)	(46)	(6)
Other comprehensive earnings (loss) net of tax	(3,375)	4,900	(7)	5,644
Balance at the end of the period	1,177	3,285	1,177	3,285
Foreign Currency Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	180	(34)	(621)	228
Other comprehensive earnings (loss) before reclassifications	(230)	156	397	(201)
Reclassifications from accumulated other comprehensive loss	3	19	177	114
Other comprehensive earnings (loss) net of tax	(227)	175	574	(87)
Balance at the end of the period	(47)	141	(47)	141
Commodity Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(477)	(1,127)	(1,642)	(1,915)
Other comprehensive earnings (loss) before reclassifications	(236)	609	(375)	574
Reclassifications from accumulated other comprehensive loss	84	346	1,388	1,169
Other comprehensive earnings (loss) net of tax	(152)	955	1,013	1,743
Balance at the end of the period	(629)	(172)	(629)	(172)
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	2,136	1,641	2,448	1,883
Reclassifications from accumulated other comprehensive loss	(154)	(122)	(466)	(364)
Other comprehensive earnings (loss) net of tax	(154)	(122)	(466)	(364)
Balance at the end of the period	1,982	1,519	1,982	1,519
Accumulated Other Comprehensive Earnings (Loss)
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(17,014)	(23,874)	(23,418)	(23,213)
Other comprehensive earnings (loss) before reclassifications	(3,310)	4,299	1,974	2,964
Reclassifications from accumulated other comprehensive loss	(67)	239	1,053	913
Other comprehensive earnings (loss) net of tax	(3,377)	4,538	3,027	3,877
Balance at the end of the period	$ (20,391)	$ (19,336)	$ (20,391)	$ (19,336)