Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Operations
Sales of goods	$ 415,375	$ 537,214	$ 561,899
Sales of services	68,139	87,309	45,293
Total net sales	483,514	624,523	607,192
Cost of goods sold	331,437	420,169	449,964
Cost of services sold	61,721	70,701	35,637
Total cost of sales	393,158	490,870	485,601
Gross profit	90,356	133,653	121,591
Selling and administrative expenses	85,976	92,648	79,814
Amortization expense	9,575	12,245	4,695
Asset impairments	135,884	80,337	0
Interest expense	6,551	4,378	512
Interest income	(228)	(206)	(530)
Equity in loss (income) of nonconsolidated investments	1,290	413	(1,282)
Other income	(1,523)	(5,585)	(678)
Total operating expenses	237,525	184,230	82,531
(Loss) income before income taxes	(147,169)	(50,577)	39,060
Income tax (benefit) expense	(5,509)	(6,132)	13,404
Net (loss) income	$ (141,660)	$ (44,445)	$ 25,656
Basic (loss) earnings per common share	$ (13.79)	$ (4.33)	$ 2.51
Diluted (loss) earnings per common share	(13.79)	(4.33)	2.48
Dividends paid per common share	$ 0.12	$ 0.16	$ 0.13