Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 159,359	$ 92,270	$ 253,604	$ 178,822
Costs and expenses:
Cost of goods sold	103,421	59,927	164,215	116,211
Selling and administrative expenses	36,298	26,885	63,787	52,748
Other periodic pension costs	333	547	618	806
Interest expense	433	1,259	1,493	2,429
Costs and Expenses, Excluding Gain on Sale of Property Plant and Equipment	140,485	88,618	230,113	172,194
Income before taxes on income	18,874	3,652	23,491	6,628
Income tax expense	3,700	871	4,950	1,471
Net income	$ 15,174	$ 2,781	$ 18,541	$ 5,157
Net income per share:
Net income per share, basic (in dollars per share)	$ 1.01	$ 0.19	$ 1.23	$ 0.35
Net income per share, diluted (in dollars per share)	$ 1.00	$ 0.18	$ 1.22	$ 0.34
Weighted average shares outstanding during the period:
Weighted average number of shares outstanding during the period, basic (in shares)	15,016,062	14,952,802	15,020,457	14,940,072
Weighted average number of shares outstanding during the period, diluted (in shares)	15,171,086	15,287,357	15,185,992	15,275,006
Other comprehensive income (loss), net of tax:
Recognition of net losses included in net periodic pension costs	$ 237	$ 256	$ 480	$ 503
Recognition of settlement loss included in net periodic pension costs	147	246	252	246
Loss on cash flow hedging activities	(6)	(6)	(11)	(11)
Foreign currency translation adjustment	(162)	49	(1,401)	21
Other comprehensive income	216	545	(680)	759
Comprehensive income	$ 15,390	$ 3,326	$ 17,861	$ 5,916
Cash dividends per common share (in dollars per share)	$ 0	$ 0.10	$ 0.10	$ 0.20
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 159,359	$ 92,270	$ 253,604	$ 178,822