Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 216,139	$ 209,320	$ 609,295	$ 585,518
Cost of sales	115,798	113,767	333,138	316,285
Gross profit	100,341	95,553	276,157	269,233
Operating expenses:
Research and development and other engineering	13,935	9,711	34,648	29,505
Selling	22,535	23,592	68,156	69,623
General and administrative	28,648	29,557	86,875	85,993
Impairment of goodwill	0	492	0	492
Gain on sale of assets	(26)	(17)	(57)	(336)
Total operating expenses	65,092	63,335	189,622	185,277
Income from operations	35,249	32,218	86,535	83,956
Interest (expense) income, net	(175)	(27)	(264)	44
Income before taxes	35,074	32,191	86,271	84,000
Provision for income taxes	13,479	11,577	33,115	30,849
Net income	$ 21,595	$ 20,614	$ 53,156	$ 53,151
Earnings per common share:
Basic (in USD per share)	$ 0.44	$ 0.42	$ 1.08	$ 1.09
Diluted (in USD per share)	$ 0.44	$ 0.42	$ 1.08	$ 1.08
Number of shares outstanding
Basic (in shares)	48,998	49,010	49,157	48,972
Diluted (in shares)	49,239	49,227	49,377	49,172
Cash dividends declared per common share (in USD per share)	$ 0.16	$ 0.14	$ 0.46	$ 0.405

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.