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Commitments and Contingencies Commitments and Contingencies Textual Information (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies [Abstract]
Company's obligation to pay to variable interest entities	$ 376,000
Number of years to pay obligations to variable interest entities	2
Fair value of letters of credit and credit enhancements	$ 117,000	$ 126,000

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 the amount of contractual guarantees to which the Company is obligated as of the balance sheet date.

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