NOTE 18 BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION Description of the Business We are a performance-driven drilling solutions and technologies company based in Tulsa, Oklahoma with operations in all major U.S. onshore basins as well as South America and the Middle East. Our drilling operations consist mainly of contracting Company-owned drilling equipment primarily to large oil and gas exploration companies. We believe we are the recognized industry leader in drilling as well as technological innovation. During the third quarter of fiscal year 2020, as part of our restructuring efforts (see Note 19Restructuring Charges ) and consistent with the manner in which our chief operating decision maker evaluates performance and allocates resources, we implemented organizational changes. We are moving from a product-based offering, such as a rig or separate technology package, to an integrated solution-based approach by combining proprietary rig technology, automation software, and digital expertise into our rig operations. Operations previously reported within the former U.S. Land and H&amp;P Technologies operating and reportable segments are now managed and presented within the North America Solutions reportable segment. As a result, beginning with the third quarter of fiscal year 2020, our drilling services operations are organized into the following reportable operating business segments: North America Solutions, Offshore Gulf of Mexico and International Solutions. All prior period segment disclosures have been recast for these segment changes. Our real estate operations, our incubator program for new research and development projects, and our wholly-owned captive insurance companies are included in "Other." Consolidated revenues and expenses reflect the elimination of intercompany transactions. Each reportable operating segment is a strategic business unit that is managed separately, and consolidated revenues and expenses reflect the elimination of all material intercompany transactions. Other includes additional non-reportable operating segments. External revenues included in "Other" primarily consist of rental income. Segment Performance We evaluate segment performance based on income or loss from continuing operations (segment operating income (loss)) before income taxes which includes:  Revenues from external and internal customers  Direct operating costs  Depreciation and amortization  Allocated general and administrative cost s  Asset impairment charges  Restructuring charges but excludes gain on sale of assets and corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges. General and administrative costs are allocated to the segments based primarily on specific identification and, to the extent that such identification is not practical, on other methods which we believe to be a reasonable reflection of the utilization of services provided. Summarized financial information of our reportable segments for the fiscal years ended September 30, 2020 , 2019 and 2018 is shown in the following tables: September 30, 2020 (in thousands) North America Solutions Offshore Gulf of Mexico International Solutions Other Eliminations Total External sales $ 1,474,380 $ 143,149 $ 144,185 $ 12,213 $  $ 1,773,927 Intersegment    36,901 (36,901 )  Total sales 1,474,380 143,149 144,185 49,114 (36,901 ) 1,773,927 Segment operating income (loss) (393,902 ) 7,478 (162,368 ) 4,403  (544,389 ) Depreciation and amortization 438,039 11,681 17,531 1,241  468,492 September 30, 2019 (in thousands) North America Solutions (1) Offshore Gulf of Mexico International Solutions Other Eliminations Total External sales $ 2,426,191 $ 147,635 $ 211,731 $ 12,933 $  $ 2,798,490 Intersegment       Total sales 2,426,191 147,635 211,731 12,933  2,798,490 Segment operating income 80,898 19,594 5,366 3,375  109,233 Depreciation and amortization 504,466 10,010 35,466 1,523  551,465 (1) Operations previously reported within the H&amp;P Technologies reportable segment are now managed and presented within the North America Solutions reportable segment. September 30, 2018 (in thousands) North America Solutions (1) Offshore Gulf of Mexico International Solutions Other Eliminations Total External sales $ 2,093,601 $ 142,500 $ 238,356 $ 12,811 $  $ 2,487,268 Intersegment       Total sales 2,093,601 142,500 238,356 12,811  2,487,268 Segment operating income (loss) 108,697 26,124 (683 ) 5,883  140,021 Depreciation and amortization 511,958 10,392 46,826 1,486  570,662 (1) Operations previously reported within the H&amp;P Technologies reportable segment are now managed and presented within the North America Solutions reportable segment. The following table reconciles segment operating income (loss) per the tables above to income (loss) from continuing operations before income taxes as reported on the Consolidated Statements of Operations: Year Ended September 30, (in thousands) 2020 2019 2018 Segment operating income (loss) $ (544,389 ) $ 109,233 $ 140,021 Gain on sale of assets 46,775 39,691 22,660 Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges (122,573 ) (128,342 ) (129,717 ) Operating income (loss) from continuing operations (620,187 ) 20,582 32,964 Other income (expense) Interest and dividend income 7,304 9,468 8,017 Interest expense (24,474 ) (25,188 ) (24,265 ) Gain (loss) on investment securities (8,720 ) (54,488 ) 1 Gain on sale of subsidiary 14,963   Other (5,384 ) (1,596 ) (876 ) Total unallocated amounts (16,311 ) (71,804 ) (17,123 ) Income (loss) from continuing operations before income taxes $ (636,498 ) $ (51,222 ) $ 15,841 The following table reconciles segment total assets to total assets as reported on the Consolidated Balance Sheets: Year Ended September 30, (in thousands) 2020 2019 Total assets (1) North America Solutions (2) $ 3,812,718 $ 5,284,141 Offshore Gulf of Mexico 93,501 102,442 International Solutions 181,181 217,094 Other 22,144 32,532 4,109,544 5,636,209 Investments and corporate operations 720,077 203,306 Total assets from continuing operations 4,829,621 5,839,515 Discontinued operations   $ 4,829,621 $ 5,839,515 (1) Assets by segment exclude investments in subsidiaries and intersegment activity. (2) Operations previously reported within the H&amp;P Technologies reportable segment are now managed and presented within the North America Solutions reportable segment. The following table presents revenues from external customers by country based on the location of service provided: Year Ended September 30, (in thousands) 2020 2019 2018 Operating revenues United States $ 1,626,407 $ 2,585,008 $ 2,247,400 Argentina 84,402 165,718 190,038 Bahrain 28,653 11,528 9,525 United Arab Emirates 24,716 4,728  Colombia 6,414 29,757 38,793 Other Foreign 3,335 1,751 1,512 Total $ 1,773,927 $ 2,798,490 $ 2,487,268 The following table presents property, plant and equipment by country based on the location of service provided: Year Ended September 30, (in thousands) 2020 2019 Property, plant and equipment, net United States $ 3,562,525 $ 4,269,405 Argentina 49,419 132,321 Colombia 21,740 61,757 Other Foreign 12,657 38,601 Total $ 3,646,341 $ 4,502,084