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Segment Information
 12 Months Ended
Dec. 31, 2020
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 and distribution; premises electrical and lighting systems; process instrumentation in the refining, chemical processing, food processing, and mining 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 services; vendor management; call center services; installation and support for building systems; program development, management and maintenance for energy systems; 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; on-site repairs, maintenance and service of heat exchangers, towers, vessels, and piping; and design, manufacturing, repair, and hydro blast cleaning of shell and tube heat exchangers and related equipment.
The following tables present financial information for each of our reportable segments for the years ended December 31, 2020, 2019, and 2018 (in thousands): 
 202020192018
Revenues from unrelated entities:
United States electrical construction and facilities services$1,973,427 $2,216,600 $1,954,323 
United States mechanical construction and facilities services3,485,495 3,340,337 2,962,843 
United States building services2,110,129 2,106,872 1,875,485 
United States industrial services797,447 1,087,543 923,109 
Total United States operations8,366,498 8,751,352 7,715,760 
United Kingdom building services430,563 423,259 414,871 
Total operations$8,797,061 $9,174,611 $8,130,631 
Total revenues:
United States electrical construction and facilities services$1,979,899 $2,220,582 $1,959,978 
United States mechanical construction and facilities services3,502,131 3,370,960 2,998,918 
United States building services2,189,236 2,182,390 1,942,663 
United States industrial services812,844 1,111,264 930,724 
Less intersegment revenues(117,612)(133,844)(116,523)
Total United States operations8,366,498 8,751,352 7,715,760 
United Kingdom building services430,563 423,259 414,871 
Total operations$8,797,061 $9,174,611 $8,130,631 
NOTE 19 - SEGMENT INFORMATION - (Continued)
202020192018
Operating income (loss):
United States electrical construction and facilities services$166,501 $161,684 $139,430 
United States mechanical construction and facilities services292,536 225,040 219,853 
United States building services113,431 114,754 93,827 
United States industrial services(2,788)44,340 27,671 
Total United States operations569,680 545,818 480,781 
United Kingdom building services20,660 18,323 15,930 
Corporate administration(98,542)(101,726)(90,415)
Restructuring expenses(2,214)(1,523)(2,306)
Impairment loss on goodwill, identifiable intangible assets,
and other long-lived assets		(232,750)— (907)
Total operations256,834 460,892 403,083 
Other corporate items:
Net periodic pension (cost) income2,980 1,553 2,743 
Interest expense(9,009)(13,821)(13,544)
Interest income1,521 2,265 2,746 
Income from continuing operations before income taxes$252,326 $450,889 $395,028 
Capital expenditures:   
United States electrical construction and facilities services$9,569 $5,876 $5,993 
United States mechanical construction and facilities services11,239 7,890 7,504 
United States building services10,366 14,291 10,414 
United States industrial services8,706 15,802 18,386 
Total United States operations39,880 43,859 42,297 
United Kingdom building services3,693 3,598 870 
Corporate administration4,396 975 312 
Total operations$47,969 $48,432 $43,479 
Depreciation and amortization of property, plant and equipment:   
United States electrical construction and facilities services$7,463 $7,550 $6,221 
United States mechanical construction and facilities services10,683 8,764 7,803 
United States building services12,284 12,728 10,324 
United States industrial services11,676 11,154 9,943 
Total United States operations42,106 40,196 34,291 
United Kingdom building services3,046 2,942 3,447 
Corporate administration1,569 807 734 
Total operations$46,721 $43,945 $38,472 
NOTE 19 - SEGMENT INFORMATION - (Continued)
202020192018
Contract assets:  
United States electrical construction and facilities services$33,640 $50,813 $38,412 
United States mechanical construction and facilities services68,058 61,225 49,302 
United States building services31,046 30,428 33,304 
United States industrial services8,657 9,820 14,117 
Total United States operations141,401 152,286 135,135 
United Kingdom building services30,555 25,544 23,108 
Total operations$171,956 $177,830 $158,243 
Contract liabilities:  
United States electrical construction and facilities services$184,775 $173,967 $163,951 
United States mechanical construction and facilities services386,180 317,083 280,846 
United States building services105,421 97,588 79,281 
United States industrial services16,027 12,404 12,307 
Total United States operations692,403 601,042 536,385 
United Kingdom building services29,849 22,600 15,905 
Total operations$722,252 $623,642 $552,290 
   
Long-lived assets:
United States electrical construction and facilities services$211,432 $215,780 $201,333 
United States mechanical construction and facilities services512,243 530,561 334,628 
United States building services492,290 458,915 436,887 
United States industrial services360,765 615,233 630,340 
Total United States operations1,576,730 1,820,489 1,603,188 
United Kingdom building services12,017 9,622 9,264 
Corporate administration4,356 1,431 1,072 
Total operations$1,593,103 $1,831,542 $1,613,524 
Total assets:
United States electrical construction and facilities services$736,395 $834,802 $702,112 
United States mechanical construction and facilities services1,542,531 1,536,325 1,081,005 
United States building services1,032,326 996,664 846,221 
United States industrial services494,178 829,793 864,446 
Total United States operations3,805,430 4,197,584 3,493,784 
United Kingdom building services227,894 181,147 146,379 
Corporate administration1,030,516 451,627 448,644 
Total operations$5,063,840 $4,830,358 $4,088,807