For our investments classified as available-for-sale, the impact of changes in fair value is recorded as an unrealized gain or loss in “Accumulated other comprehensive income (loss)” (“AOCI”), a separate component of equity. For our investments classified as trading, the impact of changes in fair value is recorded within “Other income.” In addition, investments classified as available-for-sale, are subject to impairment reviews to identify when a decline in value is other-than-temporary. For a discussion of our policies regarding other-than-temporary declines in investment value and the related methodology for recording other-than-temporary impairments of fixed maturity and equity securities, see Note 2 to the Consolidated Financial Statements.
Commercial mortgage and other loans are carried primarily at unpaid principal balances, net of unamortized deferred loan origination fees and expenses and unamortized premiums or discounts and a valuation allowance for losses. For a discussion of our policies regarding the valuation allowance for commercial mortgage and other loans see Note 2 to the Consolidated Financial Statements.
The Company’s liability for future policy benefits also includes reserves based on the present value of estimated future payments to or on behalf of contractholders related to contracts that have annuitized, where the timing and amount of payment depends on policyholder mortality. Expected mortality is generally based on the Company’s experience, industry data, and/or other factors. Interest rate assumptions are based on factors such as market conditions and expected investment returns. Although mortality and interest rate assumptions are “locked-in” upon the issuance of new insurance or annuity business with fixed and guaranteed terms, significant changes in experience or assumptions may require the Company to provide for expected future losses on a product by establishing premium deficiency reserves. Premium deficiency reserves are established, if necessary, when the liability for future policy benefits plus the present value of expected future gross premiums are determined to be insufficient to provide for expected future policy benefits and expenses.
Total investments increased $694 million from $9,499 million at December 31, 2014 to $10,193 million at December 31, 2015, primarily driven by the continued growth in the assets supporting the universal life and term life businesses, as well as increased general account investments from variable annuity sales.
Liquidity refers to the ability to generate sufficient cash resources to meet the payment obligations of the Company. Capital refers to the long term financial resources available to support the operations of our businesses, fund business growth, and provide a cushion to withstand adverse circumstances. Our ability to generate and maintain sufficient liquidity and capital depends on the profitability of our businesses, general economic conditions, our ability to borrow from affiliates and our access to the capital markets through affiliates as described herein.
As discussed in “Business--Regulation-State Insurance Regulation--Insurance Reserves and Regulatory Capital,” during February 2014, PLNJ reached an agreement with the NY DFS on reserving methodologies for New York financial reporting purposes in respect of certain variable annuity products. The Company evaluates its regulatory capital under reasonably foreseeable stress scenarios and believes we have adequate resources to maintain our capital levels comfortably above regulatory requirements under these scenarios.