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Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Liabilities at Fair Value
Fair Value Measurements at Reporting Date
Net derivative liabilities	$ (4,570)	$ (4,091)
Quoted Prices in Active Markets for Identical Liabilities (Level 1)
Fair Value Measurements at Reporting Date
Net derivative liabilities	$ (4,570)	$ (4,091)

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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