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Fair Value of Financial Instruments (Schedule of Fair Value of Derivative Instruments in the Consolidated Balance Sheets) (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets designated as hedging instruments
Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities designated as hedging instruments	$ 222,127	$ 254,228

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details