FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2021

FAIR VALUE MEASUREMENTS

Schedule of financial assets and liabilities measured at fair value

	Estimated Fair Value December 31, 2021
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and equivalents	$	105,840	$	105,840	$	—	$	—
Available for sale securities		241,407		1,282		240,125		—
Foreign currency forward contracts		426		—		426		—
Commodity futures contracts, net		124		124		—		—
Trading securities		89,736		76,196		13,540		—
Total assets measured at fair value	$	437,533	$	183,442	$	254,091	$	—

	Estimated Fair Value December 31, 2020
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and equivalents	$	166,841	$	166,841	$	—	$	—
Available for sale securities		188,282		3,149		185,133		—
Foreign currency forward contracts		778		—		778		—
Commodity futures contracts, net		941		941		—		—
Trading securities		73,828		61,431		12,397		—
Total assets measured at fair value	$	430,670	$	232,362	$	198,308	$	—

Summary of the aggregate fair value, gross unrealized gains, gross unrealized losses, realized losses and amortized cost basis of investment portfolio by major security type

	December 31, 2021
	Amortized		Fair		Unrealized				Realized
Available for Sale:	Cost		Value		Gains		Losses		Losses
Municipal bonds	$	542	$	536	$	—	$	(6)	$	—
Variable rate demand notes		—		—		—		—		—
Corporate bonds		238,045		236,332		—		(1,713)		—
Government securities		1,271		1,282		11		—		—
Certificates of deposit		3,246		3,257		11		—		—
	$	243,104	$	241,407	$	22	$	(1,719)	$	—

	December 31, 2020
	Amortized		Fair		Unrealized				Realized
Available for Sale:	Cost		Value		Gains		Losses		Losses
Municipal bonds	$	556	$	561	$	5	$	—	$	—
Variable rate demand notes		1,300		1,300		—		—		—
Corporate bonds		174,835		177,229		2,394		—		—
Government securities		3,049		3,149		100		—		—
Certificates of deposit		5,915		6,043		128		—		—
	$	185,655	$	188,282	$	2,627	$	—	$	—