Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
NET SALES	$ 468,588,997	$ 465,420,105
COST OF GOODS SOLD	298,944,494	292,791,704
Gross profit	169,644,503	172,628,401
OPERATING EXPENSES:
Engineering, research and development	28,089,181	26,049,258
Selling, general & administrative	19,958,991	18,063,810
Total operating expenses	48,048,172	44,113,068
Income from operations	121,596,331	128,515,333
OTHER INCOME (LOSS)
Investment income	3,262,741	2,037,605
Other income (loss), net	49,469	1,206,993
Total Other Income	3,312,210	3,244,598
INCOME BEFORE PROVISION FOR INCOME TAXES	124,908,541	131,759,931
PROVISION FOR INCOME TAXES	20,628,130	20,511,188
NET INCOME	$ 104,280,411	$ 111,248,743
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.40	$ 0.40
Diluted (in dollars per share)	0.40	0.40
Cash Dividends Declared per Share (in dollars per share)	$ 0.115	$ 0.110