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Segment Information
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
We have the following reportable segments: (a) United States electrical construction and facilities services (involving systems for electrical power transmission, distribution, and generation, including sustainable energy solutions such as solar, photovoltaic, and wind; premises electrical and lighting systems; process instrumentation in the refining, chemical processing, and food processing industries; low-voltage systems, such as fire alarm, security, and process control; voice and data communication, including fiber-optic and low-voltage cabling, distributed antenna systems, and audiovisual systems; roadway and transit lighting and signaling; and fiber optic lines); (b) United States mechanical construction and facilities services (involving systems for heating, ventilation, air conditioning, refrigeration, and clean-room process ventilation; fire protection; plumbing, process, and high-purity piping; controls and filtration; water and wastewater treatment; central plant heating and cooling; cranes and rigging; millwrighting; and steel fabrication, erection, and welding); (c) United States building services; (d) United States industrial services; and (e) United Kingdom building services. The “United States building services” and “United Kingdom building services” segments principally consist of those operations which provide a portfolio of services needed to support the operation and maintenance of customers’ facilities, including commercial and government site-based operations and maintenance; facility management, maintenance, and services; outage services to utilities and industrial plants; military base operations support services; mobile mechanical maintenance and services, including maintenance and service of mechanical, electrical, plumbing, and building automation systems; indoor air quality improvement services; floor care and janitorial services; landscaping, lot sweeping, and snow removal; other building services, including reception, security, and catering; vendor management; call center services; installation and support for building systems; program development, management, and maintenance for energy systems, including services aimed at assisting our customers in reducing energy consumption; technical consulting and diagnostic services; infrastructure and building projects for federal, state, and local governmental agencies and bodies; and small modification and retrofit projects, which services are not generally related to customers’construction programs. The “United States industrial services” segment principally consists of those operations which provide industrial maintenance and services for refineries, petrochemical plants, and other customers within the oil and gas industry. Services of this segment include refinery turnaround planning and engineering; specialty welding; overhaul and maintenance of critical process units; specialty technical services; instrumentation and electrical services for energy infrastructure; on-site repairs, maintenance, and service of heat exchangers, towers, vessels, and piping; and design, manufacturing, repair, and hydroblast cleaning of shell and tube heat exchangers and related equipment.
Our reportable segments reflect certain reclassifications of prior year amounts from our United States electrical construction and facilities services segment to our United States industrial services and our United States building services segments due to changes in our internal reporting structure aimed at realigning our service offerings.
NOTE 14 - Segment Information (Continued)
The following tables present financial information for each of our reportable segments for the three months ended March 31, 2021 and 2020 (in thousands): 
 For the three months ended
March 31,
 20212020
Revenues from unrelated entities:
United States electrical construction and facilities services$456,168 $461,803 
United States mechanical construction and facilities services903,925 834,112 
United States building services581,839 527,611 
United States industrial services235,382 363,929 
Total United States operations2,177,314 2,187,455 
United Kingdom building services126,735 112,377 
Total operations$2,304,049 $2,299,832 
Total revenues:
United States electrical construction and facilities services$457,533 $462,791 
United States mechanical construction and facilities services907,674 838,804 
United States building services602,735 542,018 
United States industrial services245,928 370,143 
Less intersegment revenues(36,556)(26,301)
Total United States operations2,177,314 2,187,455 
United Kingdom building services126,735 112,377 
Total operations$2,304,049 $2,299,832 

For the three months ended
March 31,
20212020
Operating income (loss):
United States electrical construction and facilities services$40,264 $40,312 
United States mechanical construction and facilities services64,950 45,171 
United States building services29,334 21,261 
United States industrial services(2,443)15,425 
Total United States operations132,105 122,169 
United Kingdom building services9,411 5,764 
Corporate administration(24,512)(21,869)
Restructuring expenses— (69)
Total operations117,004 105,995 
Other corporate items:
Net periodic pension (cost) income908 742 
Interest expense, net(1,363)(2,488)
Income before income taxes$116,549 $104,249 
NOTE 14 - Segment Information (Continued)
March 31,
2021		December 31,
2020
Total assets:
United States electrical construction and facilities services$720,703 $672,226 
United States mechanical construction and facilities services1,568,914 1,542,531 
United States building services1,069,085 1,040,160 
United States industrial services620,295 550,513 
Total United States operations3,978,997 3,805,430 
United Kingdom building services242,050 227,894 
Corporate administration840,142 1,030,516 
Total operations$5,061,189 $5,063,840