Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
NET SALES	$ 465,420,105	$ 453,535,250
COST OF GOODS SOLD	292,791,704	277,734,465
Gross profit	172,628,401	175,800,785
OPERATING EXPENSES:
Engineering, research and development	26,049,258	25,152,257
Selling, general & administrative	18,063,810	16,221,408
Total operating expenses	44,113,068	41,373,665
Income from operations	128,515,333	134,427,120
OTHER INCOME (LOSS)
Investment income	2,037,605	1,472,527
Other Income (Loss), net	1,206,993	(1,034,743)
Total Other Income	3,244,598	437,784
Income before provision for income taxes	131,759,931	134,864,904
PROVISION FOR INCOME TAXES	20,511,188	37,308,163
NET INCOME	$ 111,248,743	$ 97,556,741
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.40	$ 0.34
Diluted (in dollars per share)	0.40	0.33
Cash Dividends Declared per Share (in dollars per share)	$ 0.110	$ 0.09