Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 130,787	$ 159,359	$ 271,634	$ 253,604
Costs and expenses:
Cost of goods sold	83,629	103,421	175,433	164,215
Selling and administrative expenses	33,906	36,298	69,017	63,787
Other periodic pension costs	440	333	869	618
Pension plan termination charge	6,945	0	6,945	0
Interest expense	330	433	605	1,493
Costs and Expenses, Excluding Gain on Sale of Property Plant and Equipment	125,250	140,485	252,869	230,113
Income before taxes on income	5,537	18,874	18,765	23,491
Income tax expense	960	3,700	3,710	4,950
Net income	$ 4,577	$ 15,174	$ 15,055	$ 18,541
Net income per share:
Net income per share, basic (in dollars per share)	$ 0.30	$ 1.01	$ 0.98	$ 1.23
Net income per share, diluted (in dollars per share)	$ 0.28	$ 1.00	$ 0.94	$ 1.22
Weighted average shares outstanding during the period:
Weighted average number of shares outstanding during the period, basic (in shares)	15,433,412	15,016,062	15,327,374	15,020,457
Weighted average number of shares outstanding during the period, diluted (in shares)	16,087,736	15,171,086	16,039,605	15,185,992
Other comprehensive income (loss), net of tax:
Recognition of net losses included in net periodic pension costs	$ 391	$ 237	$ 1,105	$ 480
Recognition of settlement loss included in net periodic pension costs	0	147	0	252
Recognition of net losses included in pension plan termination charges	5,230	0	5,230	0
Loss on cash flow hedging activities	(6)	(6)	(11)	(11)
Foreign currency translation adjustment	1,033	(162)	386	(1,401)
Other comprehensive income	6,648	216	6,710	(680)
Comprehensive income	$ 11,225	$ 15,390	$ 21,765	$ 17,861
Cash dividends per common share (in dollars per share)	$ 0.12	$ 0	$ 0.22	$ 0.10
Net sales	$ 130,787	$ 159,359	$ 271,634	$ 253,604