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Segment Information
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Segment Information Segment Information
We are one of the largest specialty contractors in the United States and a leading provider of electrical and mechanical construction and facilities services, building services, and industrial services. Our services are provided to a broad range of commercial, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries. Such operating subsidiaries are organized into the following reportable segments:
•United States electrical construction and facilities services;
•United States mechanical construction and facilities services;
•United States building services;
•United States industrial services; and
•United Kingdom building services.
We refer to our United States electrical construction and facilities services segment and our United States mechanical construction and facilities services segment together as our United States construction segments.
Our reportable segments and related disclosures reflect certain reclassifications of prior year amounts from our United States mechanical construction and facilities services segment to our United States building services segment 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, 2023 and 2022 (in thousands): 
 For the three months ended
March 31,
 20232022
Revenues from unrelated entities:
United States electrical construction and facilities services$644,746 $522,030 
United States mechanical construction and facilities services1,078,558 992,644 
United States building services725,375 635,627 
United States industrial services330,883 310,751 
Total United States operations2,779,562 2,461,052 
United Kingdom building services110,870 131,497 
Total operations$2,890,432 $2,592,549 
Total revenues:
United States electrical construction and facilities services$645,654 $523,414 
United States mechanical construction and facilities services1,099,484 997,030 
United States building services748,610 660,057 
United States industrial services338,507 324,501 
Less intersegment revenues(52,693)(43,950)
Total United States operations2,779,562 2,461,052 
United Kingdom building services110,870 131,497 
Total operations$2,890,432 $2,592,549 

For the three months ended
March 31,
20232022
Operating income (loss):
United States electrical construction and facilities services$40,516 $19,993 
United States mechanical construction and facilities services86,227 58,433 
United States building services37,650 24,163 
United States industrial services15,020 13,258 
Total United States operations179,413 115,847 
United Kingdom building services5,424 10,588 
Corporate administration(29,927)(26,478)
Total operations154,910 99,957 
Other items:
Net periodic pension (cost) income(274)1,169 
Interest expense, net(1,832)(1,289)
Income before income taxes$152,804 $99,837 
NOTE 14 - Segment Information (continued)
March 31,
2023		December 31,
2022
Total assets:
United States electrical construction and facilities services$1,087,933 $1,078,405 
United States mechanical construction and facilities services1,876,261 1,835,001 
United States building services1,257,424 1,206,518 
United States industrial services626,467 552,545 
Total United States operations4,848,085 4,672,469 
United Kingdom building services273,819 255,547 
Corporate administration519,006 596,591 
Total operations$5,640,910 $5,524,607