Douglas Dirks
Analyst · Matt Carletti
Thank you, Vicki. Welcome, everyone, and thanks for joining us today. I would like to once again extend the company's apologies for any inconvenience we may have caused as a result of the rescheduling of this call. The workers compensation market experienced another difficult year in 2011. While the final underwriting results have not yet been published for 2011, A.M. Best reported a calendar year statutory combined ratio of 118% for the workers compensation industry in 2010, the highest level since 2000. And the industry observers expected even higher combined ratio for 2011. Workers compensation premium dropped from $48 billion in 2005 to $34 billion in 2010, largely because of rate decreases, competition and job losses. Also, investment yields remain at historically low levels.
So reflecting on this past year, we are pleased with what we have achieved, particularly in terms of growing premium and reducing our non-loss operating expenses. We have now reported fourth quarter net income before the LPT of $16 million or $0.46 per diluted share, an increase of $0.07 per share over the same period in 2010. The increase in earnings per share benefited from our repurchase of over 6 million common shares during 2011.
In the fourth quarter, we repositioned our investment portfolio to achieve the following strategic objectives: to reduce tax-exempt municipal exposure, to shorten duration and to increase high dividend yielding equities. Realized gains of $18 million were from the sale of municipals and longer-term treasury agency and corporate bonds. While our unrealized gains at the end of 2011 are still substantial at approximately $180 million, we chose to take some profits off the table in the fourth quarter and modestly lower overall exposure to tax-exempt municipals.
Throughout the year, we continue to build scale in our business. As a result of the growth initiatives we implemented in mid-2010, we added over 16,000 policies during 2011, increasing policy count over 36% by year end. We increased net premiums written by 31%. We added over 1,100 agencies to our distribution pipeline. Much of our growth in policy count and premium was from a higher rate of electronic submittals and our rapid quote system used by agents and strategic partners.
Additionally, our underwriting remains selective, as by year end, we succeeded in shifting a larger percentage of our in-force premium to the least hazardous groups, A and B. As a percent of the in-force premium year-over-year, hazard group A increased 4 points and hazard group B increased 1 point. Hazard groups A and B represented just over 42% of our total in-force premium at the end of 2011.
Our strategic partner business represented 24% of our in-force premiums as of December 31, 2011, compared to 22% at the end of the fourth quarter in 2010. Retention of strategic partner policies in the fourth quarter was 90% compared to overall retention of 87%. Overall, retention improved 7 percentage points in the fourth quarter year-over-year and was stable compared to the third quarter of 2011.
Year-over-year, we saw an increase of 24% in our total payroll exposure with substantial upticks in virtually all of our states. At the same time, our underwriting remains selective, as demonstrated by the shift in business to the lowest hazard groups A and B. Our markets are influenced by state-directed legislative and rate actions. We did not see significant workers compensation reform in any of our states in 2011.
In terms of rates, several states implemented rate changes, most notably, Florida, with a rate increase of 8.9% on January 1, 2012. In California, we have raised our filed pure premium rates more than 33% since early 2009. Bureau recommendations for rate increases in our markets nearly equal declines in 2011.
In the fourth quarter of 2011, relative to the third quarter, and for the first time in recent years, the change in our net rate was a positive 1%. We believe the improvements in net rate is primarily attributable to pricing increases and is influenced by changing mix in business. Year end, net rate has changed a negative 1.4% in 2011, compared with a negative 5.1% in 2010. The substantial improvement in year-over-year net rate was once again led by California. California is the nation's largest workers compensation market, and it represents over half of our business.
Throughout the year, the rating bureau released data, which indicated continued stress in the California workers compensation market. On a positive note, written premium in all of California increased 12% or $8.3 billion in the first 9 months of 2011 compared to the same period in 2010. However, industry results in California demonstrated continuing deterioration for accident year 2010. Aggregate industry data at September 30, 2011, indicated that the 2010 accident year combined ratio was 130% in California with a pure loss ratio of 84%. Indemnity claims frequency was stable for accident year 2011 compared to 2010, but was up significantly for accident year 2010 as compared to 2009. Indemnity claims severity was down slightly for accident year 2010 compared with 2009.
Employers continues to build scale going into 2012, and our change in net rate was positive in the fourth quarter of 2011 relative to the third quarter of 2011. While economic recovery coming out of the 2008-2009 recession continues to be a lengthy process, we are hearing some anecdotal evidence that our markets are beginning to firm. We have solid January renewal results across the company. We continue to actively and deliberately manage our capital. Our balance sheet remains strong, evidenced by the repurchase of over 3 million shares in the quarter and 6 million common shares in 2011.
In the past year, we returned nearly $93 million to shareholders through share repurchases, which contributed significantly to our 14% increase in book value since December 31 of last year. Approximately $93 million of the current repurchase authorization remained at December 31, 2011.
Now I'll turn the call over to Ric for a further discussion of our financial results.