Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 1,267,945	$ 1,136,539	$ 1,078,809
Cost of Goods and Services Sold	691,561	644,409	598,522
Gross profit	576,384	492,130	480,287
Operating expenses:
Research and development and other engineering	50,807	47,058	43,056
Selling	112,517	112,568	109,931
General and administrative	161,029	157,274	158,568
Total operating expenses	324,353	316,900	311,555
Net gain on disposal of assets	(332)	(6,024)	(10,579)
Impairment of goodwill	0	0	6,686
Income from operations	252,363	181,254	172,625
Other Nonoperating Income (Expense)	(2,012)	(1,730)	(634)
Foreign exchange gain (loss), net and other	(787)	(1,167)	137
Income before taxes	249,564	178,357	172,128
Provision for income taxes	62,564	44,375	45,495
Net income	187,000	133,982	126,633
Translation adjustment, net of tax	14,172	885	(12,911)
Unamortized pension adjustments, net of taxes	(161)	1,064	(376)
Unrealized gains on derivative instruments	390	0	0
Comprehensive income	$ 201,401	$ 133,803	$ 114,098
Earnings per share of common stock:
Earnings Per Share, Basic	$ 4.28	$ 3.00	$ 2.74
Earnings Per Share, Diluted	$ 4.27	$ 2.98	$ 2.72
Weighted average number of shares of common stock outstanding
Basic (in shares)	43,709	44,735	46,213
Diluted (in shares)	43,841	44,921	46,540

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.