Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2011

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)
September 30, 2011
Asset derivatives	$	—		$	—	$	—		$	—
Liability derivatives	(2,965		)	—		(2,965		)	—
Rabbi trust assets	1,356			1,356		—			—
	$	(1,609	)	$	1,356	$	(2,965	)	$	—
December 31, 2010
Asset derivatives	$	1,617		$	—	$	1,617		$	—
Liability derivatives	(667		)	—		(667		)	—
Rabbi trust assets	1,350			1,350		—			—
	$	2,300		$	1,350	$	950		$	—