Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Total net sales	$ 655,057	$ 626,969
Total cost of sales	533,685	509,810
Gross profit	121,372	117,159
Selling and administrative expenses	87,986	87,679
Amortization expense	6,577	7,098
Concrete Tie Settlement expense (Note 18)	0	43,400
Interest expense - net	(4,920)	(6,154)
Other income	4,492	(461)
Total expenses	103,975	143,870
Income (loss) before income taxes	17,397	(26,711)
Income tax expense	(25,171)	4,457
Net (loss) income	$ 42,568	$ (31,168)
Basic (loss) earnings per common share (usd per share)	$ 4.09	$ (3.01)
Diluted (loss) earnings per common share (usd per share)	$ 4.00	$ (3.01)
Sales of goods
Total net sales	$ 508,504	$ 463,165
Total cost of sales	416,748	380,395
Sales of services
Total net sales	146,553	163,804
Total cost of sales	$ 116,937	$ 129,415