The insurance business is distinguished from most others in that the prices (premiums) charged for various coverages are set without certainty of the ultimate benefit and claim costs that will emerge or be incurred, often many years after issuance of a policy. This basic fact casts Old Republic's business as a long-term undertaking which is managed with a primary focus on the achievement of favorable underwriting results over time. In addition to operating income stemming from Old Republic's basic underwriting and related services functions, significant revenues are obtained from investable funds generated by those functions as well as from retained shareholders' capital. In managing investable funds the Company aims to assure stability of income from interest and dividends, protection of capital, and sufficient liquidity to meet insurance underwriting and other obligations as they become payable in the future. Securities trading and the realization of capital gains are not objectives. The investment philosophy is therefore best categorized as emphasizing value, credit quality, and relatively long-term holding periods. The Company's ability to hold both fixed maturity and equity securities for long periods of time is enabled by the scheduling of maturities in contemplation of an appropriate matching of assets and liabilities.
changes of each of its investments on at least a quarterly basis during the year, and estimates of other than temporary impairments in the portfolio's value are evaluated and established at each quarterly balance sheet date. In reviewing investments for other than temporary impairment, the Company, in addition to a security's market price history, considers the totality of such factors as the issuer's operating results, financial condition and liquidity, its ability to access capital markets, credit rating trends, most current audit opinion, industry and securities markets conditions, and analyst expectations to reach its conclusions. Sudden market value declines caused by such adverse developments as newly emerged or imminent bankruptcy filings, issuer default on significant obligations, or reports of financial accounting developments that bring into question the validity of previously reported earnings or financial condition, are recognized as realized losses as soon as credible publicly available information emerges to confirm such developments. Accordingly, the recognition of losses from other than temporary value impairments is subject to a great deal of judgment as well as turns of events over which the Company can exercise little or no control. In the event the Company's estimate of other than temporary impairments is insufficient at any point in time, future periods' net income would be affected adversely by the recognition of additional realized or impairment losses, but its financial condition would not necessarily be affected adversely inasmuch as such losses, or a portion of them, could have been recognized previously as unrealized losses.
Mortgage Guaranty claim reserves are determined on the basis of the carried risk on reported loan defaults and on an estimate of defaulted loans that have yet to be reported. The majority of defaults reported to the Company are cured by the borrower either by making the necessary number of mortgage payments to bring the loan current, by refinancing the mortgage loan, or by selling the property in an amount sufficient to cover the outstanding mortgage debt. Estimates of claim frequency, which are based on historical trends and on judgments as to current and future economic conditions, are applied according to the level of the reported default. Claim severity is estimated based on historical claim payments including the impact of loss mitigation strategies and potential salvage recoveries. Once reported, the time required to cure a default or settle a claim can be significant, often running years from the date of original default and through changing economic conditions. As a result, mortgage guaranty loss reserve estimates take into account a large number of variables including trends in claim severity, potential salvage recoveries, expected cure rates for reported loan defaults at various stages of default, and judgments relative to future employment levels, housing market activity, and mortgage loan demand and extensions.
(c) Investments-The Company may classify its invested assets in terms of those assets relative to which it either (1) has the positive intent and ability to hold until maturity, (2) has available for sale or (3) has the intention of trading. As of December 31, 2005 and 2004, the Company's invested assets were classified as "available for sale."
(i) Property and Equipment-Property and equipment is generally depreciated or amortized over the estimated useful lives of the assets, (2 to 27 years), substantially by the straight-line method. Depreciation and amortization expenses related to property and equipment were $19.0, $18.2, and $16.2 in 2005, 2004, and 2003, respectively. Expenditures for maintenance and repairs are charged to income as incurred, and expenditures for major renewals and additions are capitalized.
We have completed an integrated audit of Old Republic International Corporation and its subsidiaries' 2005 and 2004 consolidated financial statements and of its internal control over financial reporting as of December 31, 2005 and audits of its 2004 and 2003 consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Our opinions, based on our audits, are presented below.