Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements

Schedule of financial assets and liabilities measured at fair value

	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

	Estimated Fair Value December 31, 2011
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and cash equivalents	$	78,612	$	78,612	$	—	$	—
Auction rate security	7,453		—		—		7,453
Available-for-sale securities excluding the auction rate security	57,835		—		57,835		—
Foreign currency forward contracts	205		—		205		—
Commodity futures contracts	203		203		—		—
Commodity options contracts	—		—		—		—
Trading securities	41,768		41,768		—		—
Total assets measured at fair value	$	186,076	$	120,583	$	58,040	$	7,453

	Estimated Fair Value April 2, 2011
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and cash equivalents	$	84,908	$	84,908	$	—	$	—
Auction rate security	6,775		—		—		6,775
Available-for-sale securities excluding the auction rate security	44,483		—		44,483		—
Foreign currency forward contracts	600		—		600		—
Commodity futures contracts	373		373		—		—
Commodity options contracts	2,287		2,287		—		—
Trading securities	42,536		42,536		—		—
Total assets measured at fair value	$	181,962	$	130,104	$	45,083	$	6,775

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

	2012			2011
Balance at January 1	$	7,453		$	6,775
Unrealized loss in other comprehensive earnings	(678		)	—
Balance at March 31 and April 2, respectively	$	6,775		$	6,775