Segment Information | Segment Information Reporting Segments Operating segments are defined as components of an enterprise for which separate financial information is available that is regularly evaluated by the chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. We are comprised of three reportable segments: International Services, U.S. Services and Tubular Sales. The International Services segment provides tubular services in international offshore markets and in several onshore international regions. Our customers in these international markets are primarily large exploration and production companies, including integrated oil and gas companies and national oil and gas companies. The U.S. Services segment provides tubular services in almost all of the active onshore oil and gas drilling regions in the U.S., including the Permian Basin, Bakken Shale, Barnett Shale, Eagle Ford Shale, Haynesville Shale, Marcellus Shale and Utica Shale, as well as in the U.S. Gulf of Mexico. The Tubular Sales segment designs, manufactures and distributes large outside diameter ("OD") pipe, connectors and casing attachments. We also provide specialized fabrication and welding services in support of offshore projects, including drilling and production risers, flowlines and pipeline end terminations, as well as long length tubulars (up to 300 feet in length) for use as caissons or pilings. This segment also designs and manufactures proprietary equipment for use in our International and U.S. Services segments. Adjusted EBITDA We define Adjusted EBITDA as income from continuing operations before net interest income or expense, depreciation and amortization, income tax benefit or expense, asset impairments, gain or loss on sale of assets, foreign currency gain or loss, stock-based compensation, other non-cash adjustments and unusual or non-recurring charges. We review Adjusted EBITDA on both a consolidated basis and on a segment basis. We use Adjusted EBITDA to assess our financial performance because it allows us to compare our operating performance on a consistent basis across periods by removing the effects of our capital structure (such as varying levels of interest expense), asset base (such as depreciation and amortization) and items outside the control of our management team (such as income tax rates). Adjusted EBITDA has limitations as an analytical tool and should not be considered as an alternative to net income, operating income, cash flow from operating activities or any other measure of financial performance or liquidity presented in accordance with generally accepted accounting principles in the U.S. ("GAAP"). Our CODM uses Adjusted EBITDA as the primary measure of segment reporting performance. The following table presents a reconciliation of Segment Adjusted EBITDA to income from continuing operations (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Segment Adjusted EBITDA: International Services $ 55,311 $ 48,873 $ 107,596 $ 99,902 U.S. Services 16,684 44,968 61,577 86,846 Tubular Sales 7,978 9,311 11,097 18,685 Corporate and other 31 — 24 — Adjusted EBITDA Total 80,004 103,152 180,294 205,433 Interest income (expense), net (31 ) 80 (23 ) 36 Income tax expense (10,629 ) (15,852 ) (21,891 ) (31,821 ) Depreciation and amortization (27,710 ) (21,895 ) (51,711 ) (43,088 ) (Loss) gain on sale of assets (687 ) (154 ) (871 ) 87 Foreign currency gain (loss) (2,767 ) 65 (1,234 ) — Stock-based compensation expense (8,278 ) (15,347 ) (16,288 ) (20,236 ) Severance and other charges (1,049 ) — (13,022 ) — Income from continuing operations $ 28,853 $ 50,049 $ 75,254 $ 110,411 The following tables set forth certain financial information with respect to our reportable segments. Included in “Corporate and Other” are intersegment eliminations and costs associated with activities of a general nature (in thousands): International Services U.S. Services Tubular Sales Corporate and Other Total Three Months Ended June 30, 2015 Revenue from external customers $ 122,640 $ 78,418 $ 53,246 $ — $ 254,304 Inter-segment revenues 229 6,644 10,544 (17,417 ) — Adjusted EBITDA 55,311 16,684 7,978 31 80,004 Three Months Ended June 30, 2014 Revenue from external customers $ 129,456 $ 105,564 $ 37,917 $ — $ 272,937 Inter-segment revenues 230 5,624 19,575 (25,429 ) — Adjusted EBITDA 48,873 44,968 9,311 — 103,152 Six Months Ended June 30, 2015 Revenue from external customers $ 246,841 $ 187,704 $ 97,196 $ — $ 531,741 Inter-segment revenues 606 14,558 22,435 (37,599 ) — Adjusted EBITDA 107,596 61,577 11,097 24 180,294 Six Months Ended June 30, 2014 Revenue from external customers $ 248,041 $ 209,319 $ 80,069 $ — $ 537,429 Inter-segment revenues 371 10,724 35,671 (46,766 ) — Adjusted EBITDA 99,902 86,846 18,685 — 205,433 |