Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	$ 785,376	$ 769,276	785,376	$ 769,276
Foreign Currency Translation
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(22,499)	(24,313)	(23,795)	(24,882)
Other comprehensive earnings (loss) before reclassifications	1,142	(106)	2,438	463
Other comprehensive earnings (loss) net of tax	1,142	(106)	2,438	463
Balance at the end of the period	(21,357)	(24,419)	(21,357)	(24,419)
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(6,919)	(5,722)	(8,809)	(1,286)
Other comprehensive earnings (loss) before reclassifications	(247)	(1,849)	1,643	(6,281)
Reclassifications from accumulated other comprehensive loss		(4)		(8)
Other comprehensive earnings (loss) net of tax	(247)	(1,853)	1,643	(6,289)
Balance at the end of the period	(7,166)	(7,575)	(7,166)	(7,575)
Foreign Currency Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(178)	302	(215)	322
Other comprehensive earnings (loss) before reclassifications	221	(113)	192	(56)
Reclassifications from accumulated other comprehensive loss	36	(65)	102	(142)
Other comprehensive earnings (loss) net of tax	257	(178)	294	(198)
Balance at the end of the period	79	124	79	124
Commodity Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	39	184	8	94
Other comprehensive earnings (loss) before reclassifications	(648)	(61)	(547)	50
Reclassifications from accumulated other comprehensive loss		(47)	(70)	(68)
Other comprehensive earnings (loss) net of tax	(648)	(108)	(617)	(18)
Balance at the end of the period	(609)	76	(609)	76
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	2,498	582	2,642	739
Reclassifications from accumulated other comprehensive loss	(143)	(156)	(287)	(313)
Other comprehensive earnings (loss) net of tax	(143)	(156)	(287)	(313)
Balance at the end of the period	2,355	426	2,355	426
Accumulated Other Comprehensive Earnings (Loss).
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(27,059)	(28,967)	(30,169)	(25,013)
Other comprehensive earnings (loss) before reclassifications	468	(2,129)	3,726	(5,824)
Reclassifications from accumulated other comprehensive loss	(107)	(272)	(255)	(531)
Other comprehensive earnings (loss) net of tax	361	(2,401)	3,471	(6,355)
Balance at the end of the period	$ (26,698)	$ (31,368)	$ (26,698)	$ (31,368)