Segment Information We operate under the Itron brand worldwide and manage and report under four operating segments: Electricity, Gas, Water, and Networks. Our Water operating segment includes our global water, and heat and allocation solutions. Networks became a new operating segment with the acquisition of SSNI. This structure allows each operating segment to develop its own go-to-market strategy, prioritize its marketing and research and development requirements, and focus on its strategic investments. Our sales and marketing function is managed under each operating segment. Our research and development, service delivery, and manufacturing operations are managed on a worldwide basis to promote a global perspective in our operations and processes and yet still maintain alignment with the operating segments. We have three GAAP measures of segment performance: revenue, gross profit (margin), and operating income (margin). Intersegment revenues are minimal. Certain operating expenses are allocated to our Electricity, Gas, and Water operating segments based upon internally established allocation methodologies. We will not allocate operating expenses to our Networks operating segment until it is fully integrated and managed centrally. Corporate operating expenses, interest income, interest expense, other income (expense), and income tax provision are not allocated to the operating segments, nor are included in the measure of operating segment profit or loss. In addition, we allocate only certain production assets and intangible assets to our operating segments. We do not manage the performance of the operating segments on a balance sheet basis. Segment Products Electricity Standard electricity (electromechanical and electronic) meters; smart network and data platform solutions that include one or several of the following: smart electricity meters; smart electricity communication modules; prepayment systems, including smart key, keypad, and smart card communication technologies; smart systems including handheld, mobile, and fixed network collection technologies; smart network technologies; meter data management software; knowledge application solutions; installation; implementation; and professional services including consulting and analysis. Gas Standard gas meters; smart network and data platform solutions that include one or several of the following: smart gas meters; smart gas communication modules; prepayment systems, including smart key, keypad, and smart card communication technologies; smart systems, including handheld, mobile, and fixed network collection technologies; smart network technologies; meter data management software; knowledge application solutions installation; implementation; and professional services including consulting and analysis. Water Standard water and heat meters; smart network and data platform solutions that include one or several of the following: smart water meters and communication modules; smart heat meters; smart systems including handheld, mobile, and fixed network collection technologies; meter data management software; knowledge application solutions; installation; implementation; and professional services including consulting and analysis. Networks Smart network and data platform solutions for electricity, gas, water and smart cities including advanced metering, distribution automation, demand-side management, and street lights. Solutions include one or several of the following: communications modules, access points, relays and bridges; network operating software, grid management, security and grid analytics managed services and SaaS; installation; implementation; and professional services including consulting and analysis. Revenues, gross profit, and operating income associated with our operating segments were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Product revenues Electricity $ 198,026 $ 199,784 $ 624,139 $ 620,958 Gas 148,660 124,556 408,300 372,555 Water 106,653 109,644 350,814 327,549 Networks 72,377  195,487  Total Company $ 525,716 $ 433,984 $ 1,578,740 $ 1,321,062 Service revenues Electricity $ 38,816 $ 40,358 $ 115,686 $ 108,267 Gas 8,087 7,224 23,218 22,136 Water 5,931 5,181 17,601 15,956 Networks 17,412  53,828  Total Company $ 70,246 $ 52,763 $ 210,333 $ 146,359 Total revenues Electricity $ 236,842 $ 240,142 $ 739,825 $ 729,225 Gas 156,747 131,780 431,518 394,691 Water 112,584 114,825 368,415 343,505 Networks 89,789  249,315  Total Company $ 595,962 $ 486,747 $ 1,789,073 $ 1,467,421 Gross profit Electricity $ 74,549 $ 76,492 $ 221,511 $ 222,387 Gas 55,812 46,529 139,826 147,880 Water 35,139 42,734 110,779 131,402 Networks 31,597  81,413  Total Company $ 197,097 $ 165,755 $ 553,529 $ 501,669 Operating income (loss) Electricity $ 25,853 $ 17,317 $ 52,082 $ 52,240 Gas 31,279 20,469 18,176 59,177 Water 6,859 15,032 3,973 40,702 Networks (15,624 )  (119,353 )  Corporate unallocated (6,691 ) (14,592 ) (33,087 ) (45,438 ) Total Company 41,676 38,226 (78,209 ) 106,681 Total other income (expense) (16,174 ) (4,732 ) (45,193 ) (16,559 ) Income (loss) before income taxes $ 25,502 $ 33,494 $ (123,402 ) $ 90,122 For all periods presented, no customer represents more than 10% of total company revenues. We currently buy a majority of our integrated circuit board assemblies from three suppliers. Management believes that other suppliers could provide similar products, but a change in suppliers, disputes with our suppliers, or unexpected constraints on the suppliers' production capacity could adversely affect operating results. Revenues by region were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) United States and Canada $ 376,676 $ 259,796 $ 1,080,709 $ 824,630 Europe, Middle East, and Africa 177,356 171,924 564,178 493,505 Other (1) 41,930 55,027 144,186 149,286 Total revenues $ 595,962 $ 486,747 $ 1,789,073 $ 1,467,421 (1) The Other region includes our operations in Latin America and Asia Pacific. Depreciation and amortization expense associated with our operating segments was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Electricity $ 6,008 $ 6,687 $ 18,952 $ 17,772 Gas 4,363 5,084 12,819 13,831 Water 3,824 3,860 11,941 11,706 Networks 15,214  45,449  Corporate unallocated 1,040 901 3,267 2,691 Total Company $ 30,449 $ 16,532 $ 92,428 $ 46,000 Subsequent Event On October 1, 2018, we realigned our operational reporting segmentation from Electricity, Gas, Water, and Networks to Device Solutions, Networked Solutions, and Outcomes. We will report segment information under the new segment structure in our 2018 Annual Report on Form 10-K.