Fair Value Measurements (Tables)

6 Months Ended

Jun. 29, 2013

Fair Value Measurements

Schedule of financial assets and liabilities measured at fair value

	Estimated Fair Value June 29, 2013
	Total			Input Levels Used
	Fair Value			Level 1			Level 2			Level 3
Cash and cash equivalents	$	31,946		$	31,946		$	—		$	—
Auction rate security	10,162			—			—			10,162
Available-for-sale securities excluding the auction rate security	127,704			—			127,704			—
Foreign currency forward contracts	(759		)	—			(759		)	—
Commodity futures contracts	(223		)	(223		)	—			—
Trading securities	55,753			55,753			—			—
Total assets measured at fair value	$	224,583		$	87,476		$	126,945		$	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 June 30, 2012
	Total			Input Levels Used
	Fair Value			Level 1			Level 2		Level 3
Cash and cash equivalents	$	66,617		$	66,617		$	—	$	—
Auction rate security	7,453			—			—		7,453
Available-for-sale securities excluding the auction rate security	74,016			—			74,016		—
Foreign currency forward contracts	70			—			70		—
Commodity futures contracts	(132		)	(132		)	—		—
Commodity options contracts	(18		)	(18		)	—		—
Trading securities	46,240			46,240			—		—
Total assets measured at fair value	$	194,246		$	112,707		$	74,086	$	7,453

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 loss in other comprehensive earnings	677		—
Balance at June 29 and June 30, respectively	$	10,162	$	7,453