Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
NET SALES	$ 1,858,897,406	$ 1,834,063,697	$ 1,794,872,578
COST OF GOODS SOLD	1,170,589,437	1,143,597,005	1,100,344,312
Gross profit	688,307,969	690,466,692	694,528,266
OPERATING EXPENSES:
Engineering, research and development	114,687,309	107,134,862	99,726,438
Selling, general and administrative	85,083,056	75,206,283	71,443,476
Total operating expenses	199,770,365	182,341,145	171,169,914
Income from operations	488,537,604	508,125,547	523,358,352
OTHER INCOME:
Investment income	11,230,696	11,262,385	9,442,387
Other income (expense), net	647,034	2,659,015	(1,004,035)
Total other income	11,877,730	13,921,400	8,438,352
Income before provision for income taxes	500,415,334	522,046,947	531,796,704
PROVISION FOR INCOME TAXES	75,731,395	84,163,850	125,004,782
NET INCOME	$ 424,683,939	$ 437,883,097	$ 406,791,922
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.67	$ 1.64	$ 1.42
Diluted (in dollars per share)	1.66	1.62	1.41
Cash Dividends Declared per Share (in dollars per share)	$ 0.460	$ 0.440	$ 0.390