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Segment Reporting
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting Disclosure
13. BUSINESS SEGMENTS
The Company has operating segments that are organized around three strategic business units consisting of EES, CSS and UBS. These operating segments are equivalent to the Company's reportable segments. The Company's CODM evaluates the performance of its operating segments based primarily on net sales, income from operations, and total assets.
Corporate expenses are incurred to obtain and coordinate financing, tax, information technology, legal and other related services. The Company also has various corporate assets which are reported in corporate. Segment assets may not include jointly used assets, but segment results include depreciation expense or other allocations related to those assets. Interest expense and other non-operating items are not allocated to the segments or reviewed on a segment basis. Corporate expenses are shown in the tables below to reconcile the reportable segments to the consolidated financial statements.
The following table sets forth financial information by reportable segment for the periods presented:
(In thousands)Three Months Ended March 31, 2021
EESCSSUBSCorporateTotal
Net sales$1,720,813 $1,250,615 $1,070,049 $— $4,041,477 
Income from operations100,111 73,964 87,030 (127,854)133,251 
Three Months Ended March 31, 2020
(In thousands)EESCSSUBSCorporateTotal
Net sales$1,114,457 $223,726 $630,464 $— $1,968,647 
Income from operations43,326 9,946 41,785 (34,144)60,913 
There were no material changes to the amounts of total assets by reportable segment from those disclosed in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2020.