The Company’s 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&P waste. No single contract or customer accounted for more than 10% of the Company’s 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&P segment, which includes the majority of the Company’s E&P waste treatment and disposal operations. The Company’s five geographic operating segments and its E&P segment comprise the Company’s reportable segments. Each operating segment is responsible for managing several vertically integrated operations, which are comprised of districts. In the first quarter of 2019, the Company moved two districts from the Eastern segment to the Central segment because their locations in Iowa were closer in proximity to operations in the Company’s Central segment. The segment information presented herein reflects the realignment of these districts.

Under the current orientation, the Company’s Eastern segment services customers located in northern Illinois, Kentucky, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, Vermont, Virginia and Wisconsin; the Company’s Southern segment services customers located in Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, southern Oklahoma, western Tennessee and Texas; the Company’s Western segment services customers located in Alaska, California, Idaho, Montana, Nevada, Oregon, Washington and western Wyoming; the Company’s Central segment services customers located in Arizona, Colorado, Iowa, southern Illinois, Kansas, Minnesota, Missouri, Nebraska, New Mexico, Oklahoma, South Dakota, western Texas, Utah and eastern Wyoming; and the Company’s Canada segment services customers located in the state of Michigan and in the provinces of Alberta, British Columbia, Manitoba, Ontario, Québec and Saskatchewan. The E&P segment services E&P

customers located in Arkansas, Louisiana, New Mexico, North Dakota, Oklahoma, Texas, Wyoming and along the Gulf of Mexico.

The Company’s 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 Company’s 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 Company’s reportable segments for the three and six months ended June 30, 2019 and 2018, is shown in the following tables:

Total assets for each of the Company’s reportable segments at June 30, 2019 and December 31, 2018, were as follows:


	June 30,		December 31,
	2019		2018
Eastern	$	2,720,643	$	2,673,316
Southern		2,965,048		2,892,994
Western		1,680,268		1,596,129
Central		1,880,010		1,506,326
Canada		2,496,286		2,412,971
E&P		974,023		969,808
Corporate		429,494		575,785
Total Assets	$	13,145,772	$	12,627,329

The following tables show changes in goodwill during the six months ended June 30, 2019 and 2018, by reportable segment:


	Eastern		Southern		Western		Central		Canada		E&P		Total
Balance as of December 31, 2018	$	1,143,355	$	1,517,610	$	398,174	$	523,566	$	1,448,980	$	—	$	5,031,685
Goodwill transferred		(16,869)		—		—		16,869		—		—		—
Goodwill acquired		25,294		7,726		1,122		190,383		—		—		224,525
Goodwill acquisition adjustments		—		—		—		—		(173)		—		(173)
Goodwill divested		—		(845)		—		—		—		—		(845)
Impact of changes in foreign currency		—		—		—		—		61,478		—		61,478
Balance as of June 30, 2019	$	1,151,780	$	1,524,491	$	399,296	$	730,818	$	1,510,285	$	—	$	5,316,670


	Eastern		Southern		Western		Central		Canada		E&P		Total
Balance as of December 31, 2017	$	804,133	$	1,436,320	$	397,508	$	468,275	$	1,575,538	$	—	$	4,681,774
Goodwill transferred		(16,869)		—		—		16,869		—		—		—
Goodwill acquired		120,979		4,909		666		39,155		—		—		165,709
Impact of changes in foreign currency		—		—		—		—		(74,517)		—		(74,517)
Balance as of June 30, 2018	$	908,243	$	1,441,229	$	398,174	$	524,299	$	1,501,021	$	—	$	4,772,966

A reconciliation of the Company’s 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				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Eastern segment EBITDA	$	85,048	$	73,755	$	162,005	$	140,040
Southern segment EBITDA		74,511		68,787		148,889		137,694
Western segment EBITDA		86,440		81,175		163,444		153,832
Central segment EBITDA		74,506		64,172		137,534		123,742
Canada segment EBITDA		67,664		67,305		126,908		126,571
E&P segment EBITDA		33,433		31,231		65,042		59,910
Subtotal reportable segments		421,602		386,425		803,822		741,789
Unallocated corporate overhead		(7,446)		260		(11,304)		(6,083)
Depreciation		(156,776)		(142,450)		(303,623)		(275,634)
Amortization of intangibles		(31,344)		(26,474)		(61,886)		(52,573)
Impairments and other operating items		(3,902)		(7,073)		(20,014)		(8,104)
Interest expense		(37,245)		(32,426)		(74,533)		(64,796)
Interest income		1,818		1,056		5,129		2,210
Other income, net		805		2,031		3,363		1,644
Foreign currency transaction gain (loss)		1,115		30		1,218		(190)
Income before income tax provision	$	188,627	$	181,379	$	342,172	$	338,263