Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	$ 769,042
Balance at the end of the period	769,759	$ 758,816
Foreign Currency Translation Adjustment
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(24,882)	(24,581)
Other comprehensive earnings (loss) before reclassifications	569	(397)
Other comprehensive earnings (loss) net of tax	569	(397)
Balance at the end of the period	(24,313)	(24,978)
Investments
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(1,286)	1,992
Other comprehensive earnings (loss) before reclassifications	(4,432)	(876)
Reclassifications from accumulated other comprehensive loss	(4)
Other comprehensive earnings (loss) net of tax	(4,436)	(876)
Balance at the end of the period	(5,722)	1,116
Foreign Currency Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	322	589
Other comprehensive earnings (loss) before reclassifications	57	61
Reclassifications from accumulated other comprehensive loss	(77)	(78)
Other comprehensive earnings (loss) net of tax	(20)	(17)
Balance at the end of the period	302	572
Commodity Derivatives
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	94	713
Other comprehensive earnings (loss) before reclassifications	111	301
Reclassifications from accumulated other comprehensive loss	(21)	(506)
Other comprehensive earnings (loss) net of tax	90	(205)
Balance at the end of the period	184	508
Postretirement and Pension Benefits
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	739	1,472
Reclassifications from accumulated other comprehensive loss	(157)	(267)
Other comprehensive earnings (loss) net of tax	(157)	(267)
Balance at the end of the period	582	1,205
Accumulated Other Comprehensive Earnings (Loss).
Accumulated other comprehensive earnings (loss), net of tax
Balance at the beginning of the period	(25,013)	(19,815)
Other comprehensive earnings (loss) before reclassifications	(3,695)	(911)
Reclassifications from accumulated other comprehensive loss	(259)	(851)
Other comprehensive earnings (loss) net of tax	(3,954)	(1,762)
Balance at the end of the period	$ (28,967)	$ (21,577)