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Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets/(Liabilities) at Fair Value
Fair Value Measurements at Reporting Date
Net derivative liabilities	$ (12,187)	$ (9,848)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements at Reporting Date
Net derivative liabilities	$ (12,187)	$ (9,848)

- 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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