The Company has two operating segments: 1) Oilfield and Industrial Technologies and Services and 2) Environmental Technologies and Services. Discrete financial information is available for each operating segment. Management of each operating segment reports to our Chief Executive Officer, the Company’s chief operating decision maker, who regularly evaluates income before income taxes as the measure to evaluate segment performance and to allocate resources. The accounting policies of each segment are the same as those described in the summary of significant accounting policies in Note 1 of the consolidated financial statements included in the annual report on Form 10-K for the year ended December 31, 2018.

The Company’s Oilfield and Industrial Technologies and Services segment manufactures and sells ceramic technology products and services, base ceramic proppant and frac sand for both the oilfield and industrial sectors. These products have different technology features and product characteristics, which vary based on the application for which they are intended to be used. The various ceramic products’ manufacturing processes are similar.

Oilfield ceramic technology products, base ceramic proppant and frac sand proppant are manufactured and sold to pressure pumping companies and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. The Oilfield and Industrial Technologies and Services segment also promotes increased production and Estimated Ultimate Recovery (“EUR”) of oil and natural gas by providing industry-leading technology to Design, Build, and Optimize the Frac^®. Through our wholly-owned subsidiary StrataGen, Inc., we sell one of the most widely used fracture stimulation software under the brand FracPro and provide fracture design and consulting services to oil and natural gas E&P companies under the brand StrataGen.

The Company’s industrial ceramic technology products are manufactured at the same facilities and using the same machinery and equipment as the oilfield products, however they are sold to industrial companies. These products are designed for use in various industrial technology applications, including, but not limited to, casting and milling. The Company’s chief operating decision maker reviews discreet financial information as a whole for all of the Company’s manufacturing, consulting and software businesses. Manufacturing includes the manufacture of technology products, base ceramics, industrial ceramics, sand and contract manufacturing, regardless of the industry the products are ultimately sold to. See Note 10 for disaggregated revenue information.

The Company’s Environmental Technologies and Services segment designs, manufactures and sells products and services intended to protect clients’ assets, minimize environmental risks, and lower lease operating expense (“LOE”). AGPI, a wholly-owned subsidiary of the Company, provides spill prevention, containment and countermeasure systems for the oil and gas and other industries. AGPI uses proprietary technology designed to enable its clients to extend the life of their storage assets, reduce the potential for spills and provide containment of stored materials.

Summarized financial information for the Company’s operating segments for the three months ended March 31, 2019 and 2018 is shown in the following tables. Intersegment sales are not material.

	Oilfield and Industrial Technologies and Services			Environmental Technologies and Services		Total
	($ in thousands)
Three Months Ended March 31, 2019
Revenue from external customers	$	40,087		$	7,371	$	47,458
(Loss) income before income taxes		(20,266	)		272		(19,994	)
Depreciation and amortization		7,533			268		7,801
Three Months Ended March 31, 2018
Revenue from external customers	$	42,467		$	6,900	$	49,367
(Loss) income before income taxes		(22,767	)		495		(22,272	)
Depreciation and amortization		8,736			289		9,025