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Commitments, Contingencies and Guarantees (Details Textual) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Put Obtains Upon Termination and Other	$ 123,291
Investment Commitments	3,090
Letters of Credit Outstanding, Amount	5,038
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options	15,337
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options	1,180
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 138,623	$ 117,953	$ 107,432

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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