Principal Financial Group Inc. on Thursday reported a 19 percent increase in operating earnings for the second quarter and announced a 34-cent dividend for common shareholders. Operating earnings for the Des Moines-based insurer increased to a record $323.1 million, up from $271.4 million for the year-ago quarter. Net income increased to a record $306.3 million, or $1.03 per share, compared with $222.3 million, or 75 cents per share, for the second quarter of 2013. "Second quarter 2014 results demonstrate that our growth over the last few years is sustainable and that the execution of our investment management strategy continues to excel," Principal Chairman, President and CEO Larry Zimpleman said in a release. Principal achieved a milestone in the second quarter, with total assets under management surpassing the half-trillion-dollar mark, reaching $517.9 billion, up 15 percent from the year-ago quarter. For a summary of results, click here.