Fair Value Measurements (Tables)

3 Months Ended

Mar. 30, 2013

Fair Value Measurements

Schedule of financial assets and liabilities measured at fair value

	Estimated Fair Value March 30, 2013
	Total			Input Levels Used
	Fair Value			Level 1			Level 2			Level 3
Cash and cash equivalents	$	50,887		$	50,887		$	—		$	—
Auction rate security	8,808			—			—			8,808
Available-for-sale securities excluding the auction rate security	116,771			—			116,771			—
Foreign currency forward contracts	(247		)	—			(247		)	—
Commodity futures contracts	(449		)	(449		)	—			—
Trading securities	54,377			54,377			—			—
Total assets measured at fair value	$	230,147		$	104,815		$	116,524		$	8,808

	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 March 31, 2012
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and cash equivalents	$	79,909	$	79,909	$	—	$	—
Auction rate security	6,775		—		—		6,775
Available-for-sale securities excluding the auction rate security	59,054		—		59,054		—
Foreign currency forward contracts	308		—		308		—
Commodity futures contracts	440		440		—		—
Commodity options contracts	33		33		—		—
Trading securities	47,031		47,031		—		—
Total assets measured at fair value	$	193,550	$	127,413	$	59,362	$	6,775

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		)	(678		)
Balance at March 30 and March 31, respectively	$	8,808		$	6,775