Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 199,523	$ 176,491
Cost of sales	107,000	98,993
Gross profit	92,523	77,498
Operating expenses:
Research and development and other engineering	11,423	10,197
Selling	25,187	22,607
General and administrative	29,298	28,433
Net gain on disposal of assets	(26)	(16)
Total operating expenses	65,882	61,221
Income from operations	26,641	16,277
Interest expense, net	(235)	(35)
Income before taxes	26,406	16,242
Provision for income taxes	10,063	6,191
Net income	$ 16,343	$ 10,051
Earnings per common share:
Basic (in USD per share)	$ 0.34	$ 0.20
Diluted (in USD per share)	$ 0.34	$ 0.20
Number of shares outstanding
Basic (in shares)	48,297	49,208
Diluted (in shares)	48,450	49,408
Cash dividends declared per common share (in USD per share)	$ 0.16	$ 0.140

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.