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Liquidity and Capital Resources (Details) (Special-Purpose Investment Entity VIEs, Primary Beneficiary, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Special-Purpose Investment Entity VIEs \| Primary Beneficiary
Consolidated VIEs
Cash that can only be used to settle liabilities of certain VIEs	$ 24,066

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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