11. SEGMENT REPORTING The Companys revenues are generated from the collection, transfer, recycling and disposal of non-hazardous solid waste and the treatment, recovery and disposal of non-hazardous E&amp;P waste. No single contract or customer accounted for more than 10% of the Companys total revenues at the consolidated or reportable segment level during the periods presented. The Company manages its operations through five geographic operating segments and its E&amp;P segment , which includes the majority of the Companys E&amp;P waste treatment and disposal operations. The Companys five geographic operating segments and its E&amp;P segment comprise the Companys reportable segments. Each operating segment is responsible for managing several vertically integrated operations, which are comprised of districts. The Companys Southern segment services customers located in Alabama, Arkansas, Florida, Louisiana, Mississippi, southern Oklahoma, western Tennessee and Texas; the Companys Western segment services customers located in Alaska, California, Idaho, Montana, Nevada, Oregon, Washington and western Wyoming; the Companys Eastern segment services customers located in Illinois, Iowa, Kentucky, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, Vermont, Virginia and Wisconsin; the Companys Canada segment services customers located in the state of Michigan and in the provinces of Alberta, British Columbia, Manitoba, Ontario, Quebec and Saskatchewan; and the Companys Central segment services customers located in Arizona, Colorado, Kansas, Minnesota, Missouri, Nebraska, New Mexico, Oklahoma, South Dakota, western Texas, Utah and eastern Wyoming. The E&amp;P segment services E&amp;P customers located in Arkansas, Louisiana, New Mexico, North Dakota, Oklahoma, Texas, Wyoming and along the Gulf of Mexico. The Companys Chief Operating Decision Maker evaluates operating segment profitability and determines resource allocations based on several factors, of which the primary financial measure is segment EBITDA. The Company defines segment EBITDA as earnings before interest, taxes, depreciation, amortization, impairments and other operating items, other income (expense) and foreign currency transaction gain (loss). Segment EBITDA is not a measure of operating income, operating performance or liquidity under GAAP and may not be comparable to similarly titled measures reported by other companies. The Companys management uses segment EBITDA in the evaluation of segment operating performance as it is a profit measure that is generally within the control of the operating segments. A reconciliation of segment EBITDA to Income before income tax provision is included at the end of this Note 11. Summarized financial information concerning the Companys reportable segments for the three and nine months ended September 30, 2018 and 2017, is shown in the following tables: ? Three Months Ended September 30, 2018 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c) ? Southern $ 321,306 $ (38,266) $ 283,040 $ 70,159 ? Western 303,614 (32,596) 271,018 86,174 ? Eastern 353,844 (64,347) 289,497 83,721 ? Canada 211,682 (24,628) 187,054 68,819 ? Central 213,492 (28,221) 185,271 70,288 ? E&amp;P 67,348 (2,118) 65,230 35,099 ? Corporate (a) - - - (8,286) ? $ 1,471,286 $ (190,176) $ 1,281,110 $ 405,974 ? ? Three Months Ended September 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c) ? Southern $ 317,059 $ (36,531) $ 280,528 $ 63,171 ? Western 292,222 (30,345) 261,877 84,861 ? Eastern 292,124 (45,857) 246,267 74,018 ? Canada 224,166 (27,111) 197,055 74,369 ? Central 190,210 (23,850) 166,360 64,607 ? E&amp;P 56,209 (1,818) 54,391 27,881 ? Corporate (a) - - - (5,751) ? $ 1,371,990 $ (165,512) $ 1,206,478 $ 383,156 ? ? Nine Months Ended September 30, 2018 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c) ? Southern $ 951,313 $ (111,824) $ 839,489 $ 207,853 ? Western 874,464 (94,584) 779,880 240,006 ? Eastern 966,571 (164,253) 802,318 225,950 ? Canada 615,157 (71,290) 543,867 195,390 ? Central 591,417 (77,337) 514,080 191,840 ? E&amp;P 186,734 (5,159) 181,575 95,009 ? Corporate (a) - - - (14,368) ? $ 4,185,656 $ (524,447) $ 3,661,209 $ 1,141,680 ? ? Nine Months Ended September 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c) ? Southern $ 957,506 $ (111,472) $ 846,034 $ 199,280 ? Western 845,176 (90,217) 754,959 247,475 ? Eastern 851,880 (133,578) 718,302 209,315 ? Canada 621,995 (75,846) 546,149 200,283 ? Central 536,803 (66,716) 470,087 177,975 ? E&amp;P 143,951 (6,169) 137,782 63,518 ? Corporate (a) - - - (32,535) ? $ 3,957,311 $ (483,998) $ 3,473,313 $ 1,065,311 ____________________ (a) Corporate functions include accounting, legal, tax, treasury, information technology, risk management, human resources, training and other administrative functions. Amounts reflected are net of allocations to the six operating segments. (b) Intercompany revenues reflect each segments total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are generally made on a basis intended to reflect the market value of the service. (c) For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Companys most recent Annual Report on Form 10-K. ? Total assets for each of the Companys reportable segments at September 30, 2018 and December 31, 2017, were as follows: ? ? ? September 30, 2018 December 31, 2017 ? Southern $ 2,778,123 $ 2,718,296 ? Western 1,583,561 1,573,955 ? Eastern 2,348,438 2,024,527 ? Canada 2,562,659 2,677,557 ? Central 1,452,607 1,297,118 ? E&amp;P 974,049 981,980 ? Corporate 492,629 741,248 ? Total Assets $ 12,192,066 $ 12,014,681 ? The following tables show changes in goodwill during the nine months ended September 30, 2018 and 2017, by reportable segment: ? ? ? ? Southern Western Eastern Canada Central E&amp;P Total ? Balance as of December 31, 2017 $ 1,436,320 $ 397,508 $ 804,133 $ 1,575,538 $ 468,275 $ - $ 4,681,774 ? Goodwill acquired 4,800 666 122,136 151 42,197 - 169,950 ? Goodwill adjustment for assets held for sale 10,194 - - - - - 10,194 ? Impact of changes in foreign currency - - - (48,622) - - (48,622) ? Balance as of September 30, 2018 $ 1,451,314 $ 398,174 $ 926,269 $ 1,527,067 $ 510,472 $ - $ 4,813,296 ? ? ? ? Southern Western Eastern Canada Central E&amp;P Total ? Balance as of December 31, 2016 $ 1,470,023 $ 376,537 $ 533,160 $ 1,465,274 $ 467,924 $ 77,343 $ 4,390,261 ? Goodwill acquired 7,484 20,906 272,501 7,127 1,013 - 309,031 ? Goodwill divested (31,543) - (4,276) - (667) - (36,486) ? Impairment loss - - - - - (77,343) (77,343) ? Goodwill adjustment for assets sold 2,205 - 321 - - - 2,526 ? Goodwill adjustment for assets held for sale (11,080) - - - - - (11,080) ? Impact of changes in foreign currency - - - 111,439 - - 111,439 ? Balance as of September 30, 2017 $ 1,437,089 $ 397,443 $ 801,706 $ 1,583,840 $ 468,270 $ - $ 4,688,348 ? ? A reconciliation of the Companys primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows: ? ? Three months ended September 30, Nine months ended September 30, ? 2018 2017 2018 2017 ? Southern segment EBITDA $ 70,159 $ 63,171 $ 207,853 $ 199,280 ? Western segment EBITDA 86,174 84,861 240,006 247,475 ? Eastern segment EBITDA 83,721 74,018 225,950 209,315 ? Canada segment EBITDA 68,819 74,369 195,390 200,283 ? Central segment EBITDA 70,288 64,607 191,840 177,975 ? E&amp;P segment EBITDA 35,099 27,881 95,009 63,518 ? Subtotal reportable segments 414,260 388,907 1,156,048 1,097,846 ? Unallocated corporate overhead (8,286) (5,751) (14,368) (32,535) ? Depreciation (148,232) (136,941) (423,866) (395,008) ? Amortization of intangibles (26,871) (26,613) (79,444) (76,886) ? Impairments and other operating items 1,998 (832) (6,106) (141,333) ? Interest expense (32,078) (32,471) (96,874) (92,763) ? Interest income 1,467 1,656 3,677 3,131 ? Other income, net 732 1,709 2,376 3,561 ? Foreign currency transaction loss (132) (1,864) (323) (3,502) ? Income before income tax provision $ 202,858 $ 187,800 $ 541,120 $ 362,511 ? ?