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Significant Accounting Policies (Policy) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. This ASU supersedes the previous revenue recognition requirements in ASC 605—Revenue Recognition and most industry-specific guidance throughout the ASC. The core principle within this ASU is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. This ASU is effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years. The Company continues to assess the method of application and impact, if any, of the adoption of ASU 2014-09 on its financial position, results of operations and cash flows. In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. This ASU requires that a performance target, which affects vesting and could be achieved after the requisite service period, be treated as a performance condition under the existing guidance in ASC Topic 718. This ASU is effective for annual and interim periods beginning after December 15, 2015, and early adoption is permitted. The Company does not believe the adoption of ASU 2014-12 will have a material impact on its financial position, results of operations or cash flows. In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties About and Entity’s Ability to Continue as a Going Concern. The core principle within this ASU provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. This ASU is effective for annual and interim periods beginning after December 15, 2016. Early adoption is permitted. The Company does not believe the adoption of ASU 2014-15 will have a material impact on its financial position, results of operations or cash flows.
Basis Of Presentation | Basis of Presentation The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Unless the context requires otherwise, references in these Notes to “Old Dominion,” the “Company,” “we,” “us” and “our” refer to Old Dominion Freight Line, Inc.
Revenue And Expense Recognition | Revenue and Expense Recognition We recognize revenue based upon when our transportation services have been completed in accordance with the bill of lading contract, our general tariff provisions or contractual agreements with our customers. Generally, this occurs when we complete the delivery of a shipment. For transportation services not completed at the end of a reporting period, we use a percentage of completion method to allocate the appropriate revenue to each separate reporting period. Under this method, we develop a factor for each uncompleted shipment by dividing the actual number of days in transit at the end of a reporting period by that shipment’s standard delivery time schedule. This factor is applied to the total revenue for that shipment and revenue is allocated between reporting periods accordingly. Expenses are recognized when incurred.
Allowances For Uncollectible Accounts And Revenue Adjustments | Allowances for Uncollectible Accounts and Revenue Adjustments We maintain an allowance for uncollectible accounts for estimated losses resulting from the inability of our customers to make required payments. We estimate this allowance by analyzing the aging of our customer receivables, our historical loss experience and other trends and factors affecting the credit risk of our customers. Write-offs occur when we determine an account to be uncollectible and could differ from our allowance estimate as a result of factors such as changes in the overall economic environment or risks surrounding our customers. Additional allowances may be required if the financial condition of our customers were to deteriorate, resulting in an impairment of their ability to make payments. We periodically review the underlying assumptions in our estimate of the allowance for uncollectible accounts to ensure that the allowance reflects the most recent trends and factors. We also maintain an allowance for estimated revenue adjustments resulting from future billing corrections, customer allowances, money-back service guarantees and other miscellaneous revenue adjustments. These revenue adjustments are recorded in our revenue from operations. We use historical experience, trends and current information to update and evaluate these estimates.
Credit Risk | Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist principally of customer receivables. We perform initial and ongoing credit evaluations of our customers to minimize credit risk. We generally do not require collateral but may require prepayment of our services under certain circumstances. Credit risk is generally diversified due to the large number of entities comprising our customer base and their dispersion across many different industries and geographic regions.
Cash And Cash Equivalents | Cash and Cash Equivalents We consider cash on hand and deposits in banks along with certificates of deposit and short-term marketable securities with original maturities of three months or less as cash and cash equivalents.
Property And Equipment | Property and Equipment Property and equipment are stated at cost. Major additions and improvements are capitalized, while maintenance and repairs that do not improve or extend the lives of the respective assets are charged to expense as incurred. We capitalize the cost of tires mounted on purchased revenue equipment as a part of the total equipment cost. Subsequent replacement tires are expensed at the time those tires are placed in service. We assess the realizable value of our long-lived assets and evaluate such assets for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The following table provides the estimated useful lives by asset type:
Structures |  | 7 to 30 years
Revenue equipment |  | 4 to 15 years
Other equipment |  | 2 to 20 years
Leasehold improvements |  | Lesser of economic life or life of lease
Depreciation expense, which includes the amortization of capital leases, was $145.8 million, $126.4 million and $109.8 million for 2014, 2013 and 2012, respectively.
Goodwill | Goodwill Intangible assets have been acquired in connection with business combinations and are comprised of goodwill. Goodwill is calculated as the excess cost over the fair value of assets acquired and is not subject to amortization. We review our goodwill balance annually for impairment as a single reporting unit, unless circumstances dictate more frequent assessments, and in accordance with Accounting Standards Update (“ASU”) 2011-08, Testing Goodwill for Impairment. ASU 2011-08 permits an initial assessment, commonly referred to as "step zero", of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount and also provides a basis for determining whether it is necessary to perform the two-step goodwill impairment test required by Accounting Standards Codification ("ASC") Topic 350. In the fourth quarter of 2014, we performed the qualitative assessment of goodwill and determined it was more likely than not that the fair value of our reporting unit would be greater than its carrying amount. Therefore, we determined it was not necessary to perform the two-step goodwill impairment test. Furthermore, there has been no historical impairment of our goodwill.
Claims And Insurance Accruals | Claims and Insurance Accruals At December 31, 2014, we maintained a self-insured retention ("SIR") of $2.75 million per occurrence for bodily injury and property damage ("BIPD") claims; a deductible of $100,000 per claim for cargo loss and damage; and a deductible of $1.0 million per occurrence for workers' compensation claims. We also had an SIR of $400,000 per occurrence (with a $400,000 aggregate over our retention level) for group health claims. Claims and insurance accruals reflect the estimated cost of claims for cargo loss and damage, BIPD, workers' compensation, group health and group dental not covered by insurance. These accruals include amounts for future claims development and claims incurred but not reported, which are primarily based on historical claims development experience. The related costs for cargo loss and damage and BIPD are charged to "Insurance and claims" on our Statements of Operations, while the related costs for workers' compensation, group health and group dental are charged to "Salaries, wages and benefits" on our Statements of Operations. Our liability for claims and insurance totaled $107.7 million and $100.4 million at December 31, 2014 and 2013, respectively. The long-term portions of those reserves were $65.4 million and $61.6 million for 2014 and 2013, respectively, which were included in “Other non-current liabilities” on our Balance Sheets.
Share Based Compensation | Share-Based Compensation Awards of phantom stock to employees and directors are accounted for as a liability under ASC topic 718, Compensation - Stock Compensation. ASC topic 718 requires changes in the fair value of our liability to be recognized as compensation cost over the requisite service period for the percentage of requisite service rendered each period. Changes in the fair value of the liability that occur after the requisite service period are recognized as compensation cost during the period in which the changes occur. We remeasure the liability for the outstanding awards at the end of each reporting period based on the closing price of our common stock at that date, and the compensation cost is based on the change in fair value for each reporting period.
Advertising | Advertising The costs of advertising our services are expensed as incurred and are included in “General supplies and expenses” on our Statements of Operations. Advertising costs charged to expense totaled $19.3 million, $16.7 million and $11.0 million for 2014, 2013 and 2012, respectively.
Shareholder Equity | Comprehensive Income The Company has no components of other comprehensive income. Accordingly, net income equals comprehensive income for all periods presented in this report. Stock Repurchase Program On November 10, 2014, we announced that our Board of Directors approved a stock repurchase program authorizing us to repurchase up to an aggregate of $200.0 million of our outstanding common stock. We may repurchase shares from time-to-time in open market purchases or through privately negotiated transactions. The program expires on November 6, 2016. Shares of our common stock repurchased by us under the repurchase program are canceled at the time of repurchase and are authorized but unissued shares of our common stock. As of December 31, 2014, we had repurchased 70,620 shares for approximately $5.5 million and had approximately $194.5 million still authorized under the program.
Fair Values Of Financial Instruments | Fair Values of Financial Instruments The carrying values of financial instruments in current assets and current liabilities approximate their fair value due to the short maturities of these instruments. The carrying value of our long-term debt was $155.7 million and $191.4 million at December 31, 2014 and 2013, respectively. The estimated fair value of our long-term debt was $165.5 million and $202.2 million at December 31, 2014 and 2013, respectively. The fair value measurement of our senior notes was determined using a discounted cash flow analysis that factors in current market yields for comparable borrowing arrangements under our credit profile. Since this methodology is based upon market yields for comparable arrangments, the measurement is categorized as Level 2 under the three-level fair value hierarchy as established by the Financial Accounting Standards Board (the “FASB”).
Earnings Per Share | Earnings Per Share Earnings per common share is computed using the weighted-average number of common shares outstanding during the period. There were no potentially dilutive shares outstanding at the end of each period presented in this report.

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- Definition Disclosure of accounting policy for advertising costs. For those costs that cannot be capitalized, discloses whether such costs are expensed as incurred or the first period in which the advertising takes place. For direct response advertising costs that are capitalized, describes those assets and the accounting policy used, including a description of the qualifying activity, the types of costs capitalized and the related amortization period. An entity also may disclose its accounting policy for cooperative advertising arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=32704220&loc=d3e8275-108329 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 20 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387522&loc=d3e8384-108330 + Details
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