18. Segment Information The Company operates in two reportable segments: Federal Solutions and Critical Infrastructure. The Federal Solutions segment provides advanced technical solutions to the U.S. government, delivering timely, cost-effective hardware, software and services for mission-critical projects. The segment provides advanced technologies, supporting national security missions in cybersecurity, missile defense, and military facility modernization, logistics support, hazardous material remediation and engineering services. The Critical Infrastructure segment provides integrated engineering and management services for complex physical and digital infrastructure around the globe. The Critical Infrastructure segment is a technology innovator focused on next generation digital systems and complex structures. Industry leading capabilities in engineering and project management allow the Company to deliver significant value to customers by employing cutting-edge technologies, improving timelines and reducing costs. The Company defines its reportable segments based on the way the chief operating decision maker (CODM), currently its Chairman and Chief Executive Officer, evaluates the performance of each segment and manages the operations of the Company for purposes of allocating resources among the segments. The CODM evaluates segment operating performance using segment Revenue and segment Adjusted EBITDA attributable to Parsons Corporation. The following table summarizes business segment revenue for the periods presented (in thousands): Three Months Ended Six Months Ended June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Federal Solutions revenue $ 482,210 $ 478,497 $ 959,781 $ 901,309 Critical Infrastructure revenue 497,249 511,245 990,671 992,838 Total revenue $ 979,459 $ 989,742 $ 1,950,452 $ 1,894,147 The Company defines Adjusted EBITDA attributable to Parsons Corporation as Adjusted EBITDA excluding Adjusted EBITDA attributable to noncontrolling interests. The Company defines Adjusted EBITDA as net income (loss) attributable to Parsons Corporation, adjusted to include net income (loss) attributable to noncontrolling interests and to exclude interest expense (net of interest income), provision for income taxes, depreciation and amortization and certain other items that are not considered in the evaluation of ongoing operating performance. These other items include net income (loss) attributable to noncontrolling interests, asset impairment charges, income and expense recognized on litigation matters, expenses incurred in connection with acquisitions and other non-recurring transaction costs and expenses related to our prior restructuring. The following table reconciles business segment Adjusted EBITDA attributable to Parsons Corporation to Net Income attributable to Parsons Corporation for the periods presented (in thousands): Three Months Ended Six Months Ended Adjusted EBITDA attributable to Parsons Corporation June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Federal Solutions $ 47,700 $ 35,700 $ 79,317 $ 76,299 Critical Infrastructure 35,519 40,525 62,876 68,201 Adjusted EBITDA attributable to Parsons Corporation 83,219 76,225 142,193 144,500 Adjusted EBITDA attributable to noncontrolling interests 7,942 (20 ) 9,464 3,729 Depreciation and amortization (32,081 ) (31,074 ) (64,490 ) (61,665 ) Interest expense, net (3,963 ) (6,151 ) (7,757 ) (13,966 ) Income tax (expense) benefit (11,891 ) 53,496 (16,975 ) 51,610 Equity-based compensation expense (12,854 ) (43,311 ) (5,133 ) (47,161 ) Transaction-related costs (a) 2,485 (7,715 ) (9,526 ) (17,070 ) Restructuring expense (b) (1,143 ) (353 ) (1,110 ) (2,571 ) Other (c) (589 ) (952 ) (1,170 ) (3,875 ) Net income including noncontrolling interests 31,125 40,145 45,496 53,531 Net income attributable to noncontrolling interests 7,826 (114 ) 9,224 3,531 Net income attributable to Parsons Corporation $ 23,299 $ 40,259 $ 36,272 $ 50,000 (a) Reflects costs incurred in connection with acquisitions, the IPO, and other non-recurring transaction costs, primarily fees paid for professional services and employee retention. (b) Reflects costs associated with corporate restructuring initiatives. (c) Includes a combination of gain/loss related to sale of fixed assets, software implementation costs, and other individually insignificant items that are non-recurring in nature. Asset information by segment is not a key measure of performance used by the CODM. The following tables present revenues and property and equipment, net by geographic area (in thousands): Three Months Ended Six Months Ended June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Revenue North America $ 800,044 $ 819,255 $ 1,597,990 $ 1,550,285 Middle East 174,689 167,624 343,548 335,576 Rest of World 4,726 2,863 8,914 8,286 Total Revenue $ 979,459 $ 989,742 $ 1,950,452 $ 1,894,147 The geographic location of revenue is determined by the location of the customer. June 30, 2020 December 31, 2019 Property and Equipment, Net North America $ 119,985 $ 117,606 Middle East 4,779 5,145 Total Property and Equipment, Net $ 124,764 $ 122,751 North America includes revenue in the United States for the three months ended June 30, 2020 and June 30, 2019 of $737.4 million and $744.3 million, respectively, and for the six months ended June 30, 2020 and June 30, 2019 $1.5 billion and $1.4 billion, respectively. North America property and equipment, net includes $112.6 million and $109.9 million of property and equipment, net in the United States at June 30, 2020 and December 31, 2019, respectively. The following table presents revenues by business lines (in thousands): Three Months Ended Six Months Ended June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Revenue Space &amp; Geospatial Solutions $ 57,967 $ 65,768 $ 109,255 $ 111,525 Cyber &amp; Intelligence 102,993 80,489 201,875 153,038 Engineered Systems 166,483 167,276 339,315 312,894 Missile Defense &amp; C5ISR 154,767 164,964 309,336 323,852 Federal Solutions revenues 482,210 478,497 959,781 901,309 Mobility Solutions 398,890 401,842 790,411 775,822 Connected Communities 98,359 109,403 200,260 217,016 Critical Infrastructure revenues 497,249 511,245 990,671 992,838 Total Revenue $ 979,459 $ 989,742 $ 1,950,452 $ 1,894,147 Effective January 1, 2020, the Company made changes to its business lines as described below. The prior year information in the table above has been reclassified to conform to the business line changes. Federal Solutions Business Line Changes As a result of the acquisitions of Polaris Alpha, OGSystems and QRC, we realigned the five business lines within our Federal Solutions segment into four business lines. We consolidated all space and geospatial programs from the former Geospatial Solutions, Defense and Cyber &amp; Intelligence markets into a new Space &amp; Geospatial Solutions business line to increase focus on the critical, evolving space market. This new business line better aligns capabilities and customers to drive growth and performance execution through improved agile, end-to-end solutions and dedicated customer focus. Further, we re-named our Defense business line to Missile Defense &amp; C5ISR. We moved our Missions Solutions business line into our Missile Defense &amp; C5ISR, Engineered Systems and Cyber &amp; Intelligence business lines, for better customer and capability alignment. These changes were the next logical step in our acquisition integration process, to optimize performance delivery and growth. Critical Infrastructure Business Line Changes We re-aligned our Critical Infrastructure segment from three markets to two markets. Industrial is now a part of Mobility Solutions and we moved all Middle East business into Mobility Solutions as well. We believe this will drive improved synergies among like-markets and increased collaboration in areas such as program and engineering management, civil and structural and water/wastewater treatment. We also moved Aviation to Connected Communities and consolidated the civil portion of rail and transit with the systems portion of rail and transit into a consolidated sub-market within Connected Communities to focus on growth in these critical market segments. In each, we are pursuing systems, software and hardware product advanced technology opportunities.