Consolidated Statements of Income - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
NET SALES		$ 1,688,189,405	$ 1,858,897,406	$ 1,834,063,697
COST OF GOODS SOLD		1,082,745,885	1,170,589,437	1,143,597,005
Gross profit		605,443,520	688,307,969	690,466,692
OPERATING EXPENSES:
Engineering, research and development		115,935,047	114,687,309	107,134,862
Selling, general and administrative		89,952,381	85,083,056	75,206,283
Total operating expenses		205,887,428	199,770,365	182,341,145
Income from operations		399,556,092	488,537,604	508,125,547
OTHER INCOME:
Investment income		6,986,303	11,230,696	11,262,385
Other income, net		5,270,534	647,034	2,659,015
Total other income		12,256,837	11,877,730	13,921,400
Income before provision for income taxes		411,812,929	500,415,334	522,046,947
PROVISION FOR INCOME TAXES		64,249,308	75,731,395	84,163,850
NET INCOME		$ 347,563,621	$ 424,683,939	$ 437,883,097
EARNINGS PER SHARE:
Basic (in dollars per share)	[1]	$ 1.41	$ 1.67	$ 1.64
Diluted (in dollars per share)	[1]	1.41	1.66	1.62
Cash Dividends Declared per Share (in dollars per share)		$ 0.48	$ 0.460	$ 0.44

[1] (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards