Our Personal Auto product provides coverage to individuals for liability to others for bodily injury and property damage and for physical damage to an insured's own vehicle from collision and various other perils. In addition, some states require policies to provide for first party personal injury protection, frequently referred to as no-fault coverage.

Our Classic Collector product provides coverage to individuals with classic or antique automobiles for liability to others for bodily injury and property damage and for physical damage to an insured's own vehicle from collision and various other perils.

All segment revenues are generated from external customers. The following table provides revenues by segment and a reconciliation to "Total revenues" as reported on the Consolidated Statements of Earnings ($ in thousands):

Our management uses underwriting income and combined ratios calculated on a statutory accident year basis as primary measures of profitability. Statutory accident year underwriting income is calculated by subtracting losses and loss adjustment expenses and commissions and other underwriting expenses (including bad debt charge-offs on agents' balances and premium receivables) from the total of earned premium and installment and other fee income. The statutory accident year combined ratio represents the sum of the following ratios: (i) losses and LAE incurred, excluding development from prior accident years, as a percentage of net earned premium; and (ii) underwriting expenses incurred, including bad debt and net of fees, as a percentage of net written premium.

The primary differences between the calculation of the statutory accident year used by management and the statutory calendar year combined ratios is the exclusion of bad debt charge-offs and the inclusion of development on prior accident year loss and LAE reserves.

Certain expenses are treated differently under statutory accounting principles. Under GAAP, commissions, premium taxes and other variable costs incurred in connection with successfully writing new and renewal business are capitalized as deferred policy acquisition costs and amortized on a pro rata basis over the period in which the related premium is earned. On a statutory basis, these items are expensed as incurred. Additionally, bad debt charge-offs on agents' balances and premium receivables are included in the GAAP combined ratios.

The following tables present the underwriting income and combined ratio on a statutory accident year basis with reconciliations to "Earnings before income taxes" as presented on the Consolidated Statements of Earnings ($ in thousands). We do not allocate assets or "Provision for income taxes" to operating segments.