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Fair Value Measurements Fair Values Measured on a Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying Value
Fair Value, Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Investment in special-purpose entity	$ 2,690	$ 2,879
Level 2
Fair Value, Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Investment in special-purpose entity	$ 2,690	$ 2,879

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- Definition

The carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5728-111685

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