Premiums. Gross written premiums increased by $85.5 million, or 2.0%, in 2011, compared to 2010, reflecting a $110.3 million increase in our insurance business, partially offset by a $24.8 million decrease in our reinsurance business. The year over year increase in insurance premiums was primarily due to the acquisition of Heartland, which provided $169.6 million of new crop insurance business, our recent initiative in primary medical stop loss insurance, which added $54.0 million of premium and improved premium rates on our California workers’ compensation business, partially offset by our reduced participation on a large casualty program. The decrease in reinsurance premiums was due to the continued reduction in U.S. casualty business, the loss of several large crop reinsurance contracts, as well as the planned reduction of catastrophe exposed business in certain territories, partially offset by higher reinstatement premiums, $35.8 million, resulting from catastrophe losses and favorable foreign exchange impact year over year of $49.3
Reinsurance Receivables. We have purchased reinsurance to reduce our exposure to adverse claim experience, large claims and catastrophic loss occurrences. Our ceded reinsurance provides for recovery from reinsurers of a portion of losses and loss expenses under certain circumstances. Such reinsurance does not relieve us of our obligation to our policyholders. In the event our reinsurers are unable to meet their obligations under these agreements or are able to successfully challenge losses ceded by us under the contracts, we will not be able to realize the full value of the reinsurance receivable balance. To minimize exposure from uncollectible reinsurance receivables, we have a reinsurance security committee that evaluates the financial strength of each reinsurer prior to our entering into a reinsurance arrangement. In some cases, we may hold full or partial collateral for the receivable, including letters of credit, trust assets and cash. Additionally, creditworthy foreign reinsurers of business written in the U.S. are generally required to secure their obligations. We have established reserves for uncollectible balances based on our assessment of the collectability of the outstanding balances. As of December 31, 2011 and 2010, the reserve for uncollectible balances was $21.6 million. Actual uncollectible amounts may vary, perhaps substantially, from such reserves, impacting income (loss) in the period in which the change in reserves is made. See also ITEM 8, “Financial Statements and Supplementary Data” - Note 12 of Notes to the Consolidated Financial Statements and “Financial Condition - Reinsurance Receivables” below.
Over the past few years and particularly in 2010 and 2011, we have expanded the allocation of our investments funded by shareholders’ equity to include: 1) a greater percentage of publicly traded equity securities, 2) emerging market fixed maturities through mutual fund structures, 3) high yield fixed maturities, 4) bank loan securities and 5) private equity limited partnership investments. The objective of this portfolio diversification is to enhance the risk-adjusted total return of the investment portfolio by allocating a prudent portion of the portfolio to higher return asset classes, which are also less subject to changes in value with movements in interest rates. We limit our allocation to these asset classes because of 1) the potential for volatility in their values and 2) the impact of these investments on regulatory and rating agency capital
Loss and LAE Reserves. Gross loss and LAE reserves totaled $10,123.2 million at December 31, 2011 and $9,340.2 million at December 31, 2010.
No single universal model or group of models is currently capable of projecting the amount and probability of loss in all global geographic regions in which we conduct business. In addition, the form, quality and granularity of underwriting exposure data furnished by ceding companies is not uniformly compatible with the data requirements for our licensed models, which adds to the inherent imprecision in the potential loss projections. Further, the results from multiple models and analytical methods must be combined and interpolated to estimate potential losses by and across business units. Also, while most models have been updated to incorporate claim information from recent catastrophic events, catastrophe model projections are still inherently imprecise. In addition, uncertainties with respect to future climatic patterns and cycles add to the already significant uncertainty of loss projections from models using historic long term frequency and severity data.