Significant Accounting Policies [Text Block] | Note 1. Significant Accounting Policies Business We are a leading, less-than-truckload (“LTL”), union-free motor carrier providing regional, inter-regional and national LTL services, which include ground and air expedited transportation and consumer household pickup and delivery, through a single integrated organization. In addition to our core LTL services, we offer a range of value-added services including container drayage, truckload brokerage, supply chain consulting and warehousing. We have one operating segment and the composition of our revenue is summarized below: Three Months Ended March 31, (In thousands) 2017 2016 LTL services $ 740,186 $ 694,533 Other services 13,910 13,200 Total revenue $ 754,096 $ 707,733 Basis of Presentation The accompanying unaudited, interim condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and, in management’s opinion, contain all adjustments (consisting of normal recurring items) necessary for a fair presentation, in all material respects, of the financial position and results of operations for the periods presented. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The preparation of condensed financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. Such estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Our operating results are subject to seasonal trends; therefore, the results of operations for the interim period ended March 31, 2017 are not necessarily indicative of the results that may be expected for subsequent quarterly periods or the year ending December 31, 2017 . The condensed financial statements should be read in conjunction with the financial statements and related notes, which appear in our Annual Report on Form 10-K for the year ended December 31, 2016 . There have been no significant changes in the accounting principles and policies, long-term contracts or estimates inherent in the preparation of the condensed financial statements of Old Dominion Freight Line, Inc. as previously described in our Annual Report on Form 10-K for the year ended December 31, 2016 , other than those disclosed in this Form 10-Q. 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. 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 revolving credit facility approximates fair value due to the variable interest rates of the facility that correlate with current market rates. The carrying value of our total long-term debt, including current maturities, was $95.0 million and $105.0 million at March 31, 2017 and December 31, 2016 , respectively. The estimated fair value of our total long-term debt, including current maturities, was $98.2 million and $108.3 million at March 31, 2017 and December 31, 2016 , 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 arrangements, the measurement is categorized as Level 2 under the three-level fair value hierarchy as established by the Financial Accounting Standards Board (the “FASB”). Stock Repurchase Program During the second quarter of 2016, we completed our stock repurchase program, previously announced on November 10, 2014, to repurchase up to an aggregate of $200.0 million of our outstanding common stock. On May 23, 2016, we announced that our Board of Directors had approved a new two-year stock repurchase program authorizing us to repurchase up to an aggregate of $250.0 million of our outstanding common stock (the “2016 Repurchase Program”). Under the 2016 Repurchase Program, we may repurchase shares from time to time in open market purchases or through privately negotiated transactions. Shares of our common stock repurchased under our repurchase program are canceled at the time of repurchase and are classified as authorized but unissued shares of our common stock. During the three months ended March 31, 2017 , we repurchased 600 shares of our common stock for $50,000 under our 2016 Repurchase Program. As of March 31, 2017 , we had $199.9 million remaining authorized under the 2016 Repurchase Program. Dividends On February 2, 2017, we announced that our Board of Directors had declared a quarterly cash dividend of $0.10 per share. The dividend was paid on March 20, 2017 to shareholders of record at the close of business on March 6, 2017. |