This excerpt taken from the ALL 10-K filed Feb 25, 2010.
Securities loaned and security repurchase
The Company's business activities include securities lending transactions and securities sold under agreements to repurchase ("repurchase agreements"), which are used primarily to generate net investment income. The proceeds received from repurchase agreements also provide a source of liquidity. For repurchase agreements and securities lending transactions used to generate net investment income, the proceeds received are reinvested in short-term investments or fixed income securities. These transactions are short-term in nature, usually 30 days or less.
The Company receives cash collateral for securities loaned in an amount generally equal to 102% and 105% of the fair value of domestic and foreign securities, respectively, and records the related obligations to return the collateral in other liabilities and accrued expenses. The carrying value of these obligations approximates fair value because of their relatively short-term nature. The Company monitors the market value of securities loaned on a daily basis and obtains additional collateral as necessary under the terms of the agreements to mitigate counterparty credit risk. The Company maintains the right and ability to redeem the securities loaned on short notice. Substantially all of the Company's securities loaned are placed with large banks.
Securities to be repurchased under repurchase agreements are the same, or substantially the same, as the securities transferred. The Company's obligations to return the funds received under repurchase agreements are carried at the amount at which the securities will subsequently be reacquired, including accrued interest, as specified in the respective agreements and are classified as other liabilities and accrued expenses. The carrying value of these obligations approximates fair value because of their relatively short-term nature.