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Segment Information
 6 Months Ended
Jun. 30, 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 15 - Segment Information (Continued)
The following tables present financial information for each of our reportable segments for the three and six months ended June 30, 2021 and 2020 (in thousands): 
 For the three months ended
June 30,
 20212020
Revenues from unrelated entities:
United States electrical construction and facilities services$489,487 $410,388 
United States mechanical construction and facilities services958,686 790,441 
United States building services624,456 478,982 
United States industrial services235,163 241,093 
Total United States operations2,307,792 1,920,904 
United Kingdom building services129,874 93,117 
Total operations$2,437,666 $2,014,021 
Total revenues:
United States electrical construction and facilities services$490,157 $411,417 
United States mechanical construction and facilities services962,338 793,040 
United States building services648,512 500,018 
United States industrial services252,444 242,795 
Less intersegment revenues(45,659)(26,366)
Total United States operations2,307,792 1,920,904 
United Kingdom building services129,874 93,117 
Total operations$2,437,666 $2,014,021 

 For the six months ended
June 30,
 20212020
Revenues from unrelated entities:
United States electrical construction and facilities services$945,655 $872,191 
United States mechanical construction and facilities services1,862,611 1,624,553 
United States building services1,206,295 1,006,593 
United States industrial services470,545 605,022 
Total United States operations4,485,106 4,108,359 
United Kingdom building services256,609 205,494 
Total operations$4,741,715 $4,313,853 
Total revenues:
United States electrical construction and facilities services$947,690 $874,208 
United States mechanical construction and facilities services1,870,012 1,631,844 
United States building services1,251,247 1,042,036 
United States industrial services498,372 612,938 
Less intersegment revenues(82,215)(52,667)
Total United States operations4,485,106 4,108,359 
United Kingdom building services256,609 205,494 
Total operations$4,741,715 $4,313,853 
NOTE 15 - Segment Information (Continued)
For the three months ended
June 30,
20212020
Operating income (loss):
United States electrical construction and facilities services$42,705 $31,626 
United States mechanical construction and facilities services79,259 66,937 
United States building services30,310 26,615 
United States industrial services(208)3,282 
Total United States operations152,066 128,460 
United Kingdom building services7,047 5,351 
Corporate administration(25,755)(23,699)
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets— (232,750)
Total operations133,358 (122,638)
Other items:
Net periodic pension (cost) income922 718 
Interest expense, net(1,316)(2,110)
Income (loss) before income taxes$132,964 $(124,030)

For the six months ended
June 30,
20212020
Operating income (loss):
United States electrical construction and facilities services$82,969 $71,938 
United States mechanical construction and facilities services144,209 112,108 
United States building services59,644 47,876 
United States industrial services(2,651)18,707 
Total United States operations284,171 250,629 
United Kingdom building services16,458 11,115 
Corporate administration(50,267)(45,568)
Restructuring expenses— (69)
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets— (232,750)
Total operations250,362 (16,643)
Other items:
Net periodic pension (cost) income1,830 1,460 
Interest expense, net(2,679)(4,598)
Income (loss) before income taxes$249,513 $(19,781)
NOTE 15 - Segment Information (Continued)
June 30,
2021		December 31,
2020
Total assets:
United States electrical construction and facilities services$737,673 $672,226 
United States mechanical construction and facilities services1,600,189 1,542,531 
United States building services1,131,845 1,040,160 
United States industrial services611,273 550,513 
Total United States operations4,080,980 3,805,430 
United Kingdom building services247,837 227,894 
Corporate administration804,353 1,030,516 
Total operations$5,133,170 $5,063,840