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Auction Guarantees (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Feb. 20, 2013 Subsequent Event [Member]	Dec. 31, 2012 Auction [Member]	Dec. 31, 2011 Auction [Member]
Outstanding guarantee maximum exposure	$ 69,500,000		$ 0
Purchase Price if Irrevocable Bids are Winning Bids	70,900,000
Auction guarantee advances				16,224,000	7,512,000
Estimated fair value of obligation to perform under auction guarantees	$ 3,300,000	$ 900,000

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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