Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements

Schedule of assets measured at fair value using the market value approach on a recurring basis

	Fair Value Measurements at Reporting Date Using
Description	Assets/(Liabilities) at Fair Value			Quoted Prices in Active Markets for Identical Liabilities (Level 1)			Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
				March 31, 2012
Net derivative liabilities*	$	(12,187	)	$	(12,187	)	$	—	$	—
				December 31, 2011
Net derivative liabilities*	$	(9,848	)	$	(9,848	)	$	—	$	—

*The only recurring measurements are derivative related and assets and liabilities are netted together in the table above.