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## Non-GAAP Measures 

We believe investors’ understanding of our performance is enhanced by our disclosure of underwriting income (loss), which is a measure that is not calculated in accordance with GAAP. Underwriting income (loss) represents the pre-tax profitability of our insurance operations and is derived by subtracting net realized and unrealized gains (losses) on investments and net investment income from income (loss) before federal income tax expense (benefit). For 2018, we also had a goodwill impairment charge, which was excluded from the calculation of 2018 underwriting income (loss). We use underwriting income (loss) as an internal performance measure in the management of our operations because we believe it gives us and users of our financial information useful insight into our results of operations, our underlying business performance and our ongoing operating trends. Underwriting income (loss) should not be viewed as a substitute for income (loss) before federal income tax expense (benefit) calculated in accordance with GAAP, and other companies may define underwriting income (loss) differently. 

The ratio of consolidated other operating expenses, less commissions and other income, to net premiums earned, or our expense ratio, and the ratio of losses and loss expenses incurred, plus other operating expenses, less commissions and other income, to net premiums earned, or our combined ratio, are measures of our profitability that we believe increase the period-to-period comparability of our operational results. For 2018, the goodwill impairment charge was excluded from other operating expenses when calculating our expense ratio and our combined ratio, as these ratios are intended to depict our underlying business performance and ongoing operating trends. Our management uses these ratios to evaluate performance, allocate resources and forecast future operating periods. While expense ratios and combined ratios are widely used within our industry, our use of such ratios may not be directly comparable to similarly titled measures reported by other companies. 

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