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Investment in Investee Investment in investee (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	0.00%	0.00%
Equity Method Investment, Ownership Percentage	0.00%	0.00%
Equity Method Investments, Fair Value Disclosure	$ 26,000,000	$ 38,800,000
Equity Method Investments	$ 26,526,000	$ 41,733,000

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

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 investments accounted for under the equity method of accounting as of the balance sheet date.

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