Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

				Fair Value Measurements Using
Description	Total			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
March 31, 2012
Asset derivatives	$	847		$	—	$	847		$	—
Liability derivatives	(93		)	—		(93		)	—
Rabbi trust assets	1,922			1,922		—			—
	$	2,676		$	1,922	$	754		$	—
December 31, 2011
Asset derivatives	$	304		$	—	$	304		$	—
Liability derivatives	(976		)	—		(976		)	—
Rabbi trust assets	1,494			1,494		—			—
	$	822		$	1,494	$	(672	)	$	—