Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 244,779	$ 219,867
Cost of sales	136,253	119,711
Gross profit	108,526	100,156
Operating expenses:
Research and development and other engineering	11,150	11,819
Selling	27,573	29,637
General and administrative	38,191	36,121
Net gain on disposal of assets	(1,184)	(51)
Total operating expenses	75,730	77,526
Income from operations	32,796	22,630
Loss in equity method investment, before tax	(24)	(28)
Interest expense, net	(90)	(189)
Gain on bargain purchase of a business	0	8,388
Income before taxes	32,682	30,801
Provision for income taxes	7,253	7,680
Net income	$ 25,429	$ 23,121
Earnings per common share:
Basic (in dollars per share)	$ 0.55	$ 0.49
Diluted (in dollars per share)	$ 0.54	$ 0.48
Number of shares outstanding
Basic (in shares)	46,615	47,616
Diluted (in shares)	47,009	47,906
Cash dividends declared per common share (in dollars per share)	$ 0.21	$ 0.18

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements.

No definition available.