The Company manages its business under two operating segments, Material Handling and Distribution, consistent with the manner in which our Chief Operating Decision Maker evaluates performance and makes resource allocation decisions. None of the reportable segments include operating segments that have been aggregated. These segments contain individual business components that have been combined on the basis of common management, customers, products, production processes and other economic characteristics. The Company accounts for intersegment sales and transfers at cost plus a specified mark-up.

The Material Handling Segment manufactures a broad selection of plastic reusable containers, pallets, small parts bins, bulk shipping containers, storage and organization products and rotationally-molded plastic tanks for water, fuel and waste handling. This segment conducts its primary operations in the United States and Canada. Markets served include industrial manufacturing, food processing, retail/wholesale products distribution, agriculture, automotive, recreational vehicles, marine vehicles, healthcare, appliance, bakery, electronics, textiles, consumer, and others. Products are sold both directly to end-users and through distributors.

The Distribution Segment is engaged in the distribution of equipment, tools, and supplies used for tire servicing and automotive undervehicle repair and the manufacture of tire repair and retreading products. The product line includes categories such as tire valves and accessories, tire changing and balancing equipment, lifts and alignment equipment, service equipment and tools, and tire repair/retread supplies. The Distribution Segment also manufactures and sells certain traffic markings, including reflective highway marking tape. The Distribution Segment operates domestically through its sales offices and five regional distribution centers in the United States, and in certain foreign countries through export sales. In addition, the Distribution Segment operates directly in certain foreign markets, principally Central America, through foreign branch operations. Markets served include retail and truck tire dealers, commercial auto and truck fleets, auto dealers, general service and repair centers, tire retreaders, and government agencies. The acquisition of Tuffy, described in Note 3, is included in the Distribution Segment.

Total sales from foreign business units were approximately $42.0 million, $50.6 million, and $53.9 million for the years ended December 31, 2019, 2018 and 2017, respectively. Total export sales to countries outside the U.S. were approximately $23.6 million, $19.6 million, and $17.2 million for the years ended December 31, 2019, 2018 and 2017 respectively. Sales made to customers in Canada accounted for approximately 4.7% of total net sales in 2019, 4.1% in 2018 and 2.4% in 2017. There are no other individual foreign countries for which sales are material. Long-lived assets in foreign countries, primarily in Canada, consisted of property, plant and equipment, and were approximately $13.2 million at December 31, 2019 and $14.1 million at December 31, 2018.

	2019			2018			2017
Net Sales
Material Handling	$	356,407		$	417,199		$	391,313
Distribution		159,349			149,636			156,428
Inter-company sales		(58	)		(100	)		(698	)
Total net sales	$	515,698		$	566,735		$	547,043

Operating income
Material Handling	$	53,144		$	57,948		$	38,874
Distribution		10,076			7,441			9,073
Corporate		(25,954	)		(59,062	)		(23,059	)
Total operating income		37,266			6,327			24,888
Interest expense, net		(4,083	)		(4,938	)		(7,292	)
Loss on extinguishment of debt		—			—			(1,888	)
Income from continuing operations before income taxes	$	33,183		$	1,389		$	15,708

Total Assets
Material Handling	$	193,751		$	229,962		$	257,863
Distribution		75,338			48,575			49,822
Corporate		84,050			70,108			48,257
Total assets	$	353,139		$	348,645		$	355,942

Capital Additions, Net
Material Handling	$	8,835		$	4,500		$	5,165
Distribution		1,396			587			622
Corporate		63			36			27
Total capital additions, net	$	10,294		$	5,123		$	5,814

Depreciation and Amortization
Material Handling	$	21,282		$	24,159		$	28,506
Distribution		1,501			1,169			1,174
Corporate		800			811			1,151
Total depreciation and amortization	$	23,583		$	26,139		$	30,831