Fair Value Measurements (Tables)

9 Months Ended

Sep. 28, 2013

Fair Value Measurements

Schedule of financial assets and liabilities measured at fair value

	Estimated Fair Value September 28, 2013
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and cash equivalents	$	32,734	$	32,734	$	—	$	—
Auction rate security	10,162		—		—		10,162
Available for sale securities excluding the auction rate security	123,391		—		123,391		—
Foreign currency forward contracts	29		—		29		—
Commodity futures contracts	97		97		—		—
Trading securities	58,968		58,968		—		—
Total assets measured at fair value	$	225,381	$	91,799	$	123,420	$	10,162

	Estimated Fair Value December 31, 2012
	Total			Input Levels Used
	Fair Value			Level 1			Level 2		Level 3
Cash and cash equivalents	$	63,862		$	63,862		$	—	$	—
Auction rate security	9,485			—			—		9,485
Available for sale securities excluding the auction rate security	84,568			—			84,568		—
Commodity futures contracts, net	(112		)	(112		)	—		—
Trading securities	49,378			49,378			—		—
Total assets measured at fair value	$	207,181		$	113,128		$	84,568	$	9,485

	Estimated Fair Value September 29, 2012
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and cash equivalents	$	37,124	$	37,124	$	—	$	—
Auction rate security	8,130		—		—		8,130
Available for sale securities excluding the auction rate security	84,437		—		84,437		—
Foreign currency forward contracts	—		—		—		—
Commodity futures contracts	48		48		—		—
Commodity options contracts	100		100		—		—
Trading securities	48,382		48,382		—		—
Total assets measured at fair value	$	178,221	$	85,654	$	84,437	$	8,130

Schedule of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

	2013		2012
Balance at January 1	$	9,485	$	7,453
Unrealized gain in other comprehensive earnings	677		677
Balance at September 28 and September 29, respectively	$	10,162	$	8,130