Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 347,642	$ 283,668
Cost of sales	185,360	154,002
Gross profit	162,282	129,666
Operating expenses:
Research and development and other engineering	14,591	13,382
Selling	30,823	28,527
General and administrative	48,565	38,471
Total operating expenses	93,979	80,380
Net gain on disposal of assets	(80)	(64)
Income from operations	68,383	49,350
Interest expense, net and other	(1,778)	(2,533)
Income before taxes	66,605	46,817
Provision for income taxes	16,218	9,991
Net income	50,387	36,826
Translation adjustment	(9,264)	(7,593)
Unamortized pension adjustments	492	273
Unrealized gains on derivative instruments	26	0
Comprehensive net income	$ 41,641	$ 29,506
Earnings per common share:
Basic	$ 1.16	$ 0.84
Diluted	$ 1.16	$ 0.83
Number of shares outstanding
Basic	43,379	44,099
Diluted	43,612	44,286
Cash dividends declared per common share (in dollars per share)	$ 0.23	$ 0.23

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.