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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Financial assets and liabilities measured at fair value on a recurring basis
Available for sale and trading securities	$ 23,325
Derivative financial instruments, net	5,896
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities measured at fair value on a recurring basis
Available for sale and trading securities	23,325
Derivative financial instruments, net	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets and liabilities measured at fair value on a recurring basis
Available for sale and trading securities	0
Derivative financial instruments, net	5,896
Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities measured at fair value on a recurring basis
Available for sale and trading securities	0
Derivative financial instruments, net	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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