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Segment Information
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Segment Information
Segment Information
Our reportable segments 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.
We have the following reportable segments which provide services associated with the design, integration, installation, start-up, operation and maintenance of various systems: (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 process, food process and mining industries; low-voltage systems, such as fire alarm, security and process control; voice and data communication; roadway and transit lighting; 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 our customers’ facilities, including commercial and government site-based operations and maintenance; facility maintenance and services, including reception, security and catering services; outage services to utilities and industrial plants; military base operations support services; mobile maintenance and services; floor care and janitorial services; landscaping, lot sweeping and snow removal; facilities management; 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, including those for refineries and petrochemical plants, including on-site repairs, maintenance and service of heat exchangers, towers, vessels and piping; design, manufacturing, repair and hydro blast cleaning of shell and tube heat exchangers and related equipment; refinery turnaround planning and engineering services; specialty welding services; overhaul and maintenance of critical process units in refineries and petrochemical plants; and specialty technical services for refineries and petrochemical plants.
The following tables present information about industry segments and geographic areas for the three months ended March 31, 2017 and 2016 (in thousands): 
 
For the three months ended March 31,
 
2017
 
2016
Revenues from unrelated entities:
 
 
 
United States electrical construction and facilities services
$
443,016

 
$
348,289

United States mechanical construction and facilities services
671,129

 
608,428

United States building services
440,030

 
443,113

United States industrial services
258,539

 
257,504

Total United States operations
1,812,714

 
1,657,334

United Kingdom building services
79,018

 
87,636

Total worldwide operations
$
1,891,732

 
$
1,744,970

 
 
 
 
Total revenues:
 
 
 
United States electrical construction and facilities services
$
444,016

 
$
354,104

United States mechanical construction and facilities services
679,391

 
611,770

United States building services
454,944

 
455,797

United States industrial services
258,905

 
257,870

Less intersegment revenues
(24,542
)
 
(22,207
)
Total United States operations
1,812,714

 
1,657,334

United Kingdom building services
79,018

 
87,636

Total worldwide operations
$
1,891,732

 
$
1,744,970



NOTE 13 Segment Information - (Continued)

 
For the three months ended March 31,
 
2017
 
2016
Operating income (loss):
 
 
 
United States electrical construction and facilities services
$
31,034

 
$
16,707

United States mechanical construction and facilities services
40,433

 
23,781

United States building services
14,209

 
13,998

United States industrial services
17,044

 
18,866

Total United States operations
102,720

 
73,352

United Kingdom building services
1,679

 
3,311

Corporate administration
(21,060
)
 
(20,957
)
Restructuring expenses
(565
)
 
(91
)
Total worldwide operations
82,774

 
55,615

Other corporate items:
 
 
 
Interest expense
(3,071
)
 
(2,376
)
Interest income
257

 
165

Income from continuing operations before income taxes
$
79,960

 
$
53,404


 
March 31,
2017
 
December 31,
2016
Total assets:
 
 
 
United States electrical construction and facilities services
$
617,529

 
$
631,581

United States mechanical construction and facilities services
958,733

 
954,633

United States building services
798,606

 
753,434

United States industrial services
901,420

 
850,434

Total United States operations
3,276,288

 
3,190,082

United Kingdom building services
114,951

 
105,081

Corporate administration
413,923

 
557,275

Total worldwide operations
$
3,805,162

 
$
3,852,438