Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Sales of goods	$ 431,818	$ 415,375	$ 537,214
Sales of services	104,559	68,139	87,309
Total net sales	536,377	483,514	624,523
Cost of goods sold	346,985	331,437	420,169
Cost of services sold	86,140	61,721	70,701
Total cost of sales	433,125	393,158	490,870
Gross profit	103,252	90,356	133,653
Selling and administrative expenses	80,521	85,976	92,648
Amortization expense	6,992	9,575	12,245
Asset impairments	0	135,884	80,337
Interest expense	8,377	6,551	4,378
Interest income	(307)	(228)	(206)
Equity (income) loss of nonconsolidated investments	(6)	1,290	413
Other income	(367)	(1,523)	(5,585)
Total operating expenses	95,210	237,525	184,230
Income (loss) before income taxes	8,042	(147,169)	(50,577)
Income tax expense (benefit)	3,929	(5,509)	(6,132)
Net income (loss)	$ 4,113	$ (141,660)	$ (44,445)
Basic (loss) earnings per common share (usd per share)	$ 0.40	$ (13.79)	$ (4.33)
Diluted (loss) earnings per common share (usd per share)	0.39	(13.79)	(4.33)
Dividends paid per common share (usd per share)	$ 0.00	$ 0.12	$ 0.16

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. This item also represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.

No definition available.