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; 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 and 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 maintenance and services, including reception, security and catering services; outage services to utilities and industrial plants; military base operations support services; mobile mechanical 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 years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Revenues from unrelated entities:
United States electrical construction and facilities services	$	1,954,323		$	1,829,567		$	1,704,403
United States mechanical construction and facilities services	3,020,307			2,963,815			2,643,321
United States building services	1,875,485			1,753,703			1,810,229
United States industrial services	865,645			799,169			1,067,315
Total United States operations	7,715,760			7,346,254			7,225,268
United Kingdom building services	414,871			340,745			326,256
Total worldwide operations	$	8,130,631		$	7,686,999		$	7,551,524

Total revenues:
United States electrical construction and facilities services	$	1,959,978		$	1,836,985		$	1,728,920
United States mechanical construction and facilities services	3,061,832			2,994,700			2,662,100
United States building services	1,942,663			1,812,763			1,864,824
United States industrial services	867,810			801,531			1,068,662
Less intersegment revenues	(116,523		)	(99,725		)	(99,238		)
Total United States operations	7,715,760			7,346,254			7,225,268
United Kingdom building services	414,871			340,745			326,256
Total worldwide operations	$	8,130,631		$	7,686,999		$	7,551,524



Operating income (loss):
United States electrical construction and facilities services	$	139,430		$	150,001		$	101,761
United States mechanical construction and facilities services	219,352			212,396			132,743
United States building services	93,827			81,720			77,100
United States industrial services	28,172			19,084			77,845
Total United States operations	480,781			463,201			389,449
United Kingdom building services	15,930			12,905			10,086
Corporate administration	(90,415		)	(87,808		)	(88,740		)
Restructuring expenses	(2,306		)	(1,577		)	(1,438		)
Impairment loss on goodwill and identifiable intangible assets	(907		)	(57,819		)	(2,428		)
Total worldwide operations	403,083			328,902			306,929
Other corporate items:
Net periodic pension (cost) income	2,743			1,652			1,529
Interest expense	(13,544		)	(12,770		)	(12,627		)
Interest income	2,746			965			663
Income from continuing operations before income taxes	$	395,028		$	318,749		$	296,494



	2018		2017		2016
Capital expenditures:
United States electrical construction and facilities services	$	5,993	$	4,797	$	5,294
United States mechanical construction and facilities services	7,613		6,778		7,672
United States building services	10,414		10,745		11,080
United States industrial services	18,277		9,583		10,065
Total United States operations	42,297		31,903		34,111
United Kingdom building services	870		2,166		4,523
Corporate administration	312		615		1,014
Total worldwide operations	$	43,479	$	34,684	$	39,648

Depreciation and amortization of Property, plant and equipment:
United States electrical construction and facilities services	$	6,221	$	6,545	$	6,318
United States mechanical construction and facilities services	8,104		7,819		7,544
United States building services	10,324		11,051		10,241
United States industrial services	9,642		10,274		10,394
Total United States operations	34,291		35,689		34,497
United Kingdom building services	3,447		3,371		3,560
Corporate administration	734		855		824
Total worldwide operations	$	38,472	$	39,915	$	38,881



Contract assets:
United States electrical construction and facilities services	$	38,412	$	35,060	$	46,193
United States mechanical construction and facilities services	50,463		52,381		46,703
United States building services	33,304		26,028		28,084
United States industrial services	12,956		1,636		2,572
Total United States operations	135,135		115,105		123,552
United Kingdom building services	23,108		7,516		7,145
Total worldwide operations	$	158,243	$	122,621	$	130,697

Contract liabilities:
United States electrical construction and facilities services	$	163,951	$	178,454	$	163,794
United States mechanical construction and facilities services	285,103		290,216		271,811
United States building services	79,281		48,481		50,546
United States industrial services	8,050		3,098		1,823
Total United States operations	536,385		520,249		487,974
United Kingdom building services	15,905		3,907		1,268
Total worldwide operations	$	552,290	$	524,156	$	489,242



	2018		2017		2016
Long-lived assets:
United States electrical construction and facilities services	$	201,333	$	180,990	$	183,632
United States mechanical construction and facilities services	346,977		352,970		287,744
United States building services	436,887		409,718		401,154
United States industrial services	617,991		630,184		709,267
Total United States operations	1,603,188		1,573,862		1,581,797
United Kingdom building services	9,264		11,729		11,446
Corporate administration	1,072		1,494		1,734
Total worldwide operations	$	1,613,524	$	1,587,085	$	1,594,977



Total assets:
United States electrical construction and facilities services	$	702,112	$	617,471	$	631,581
United States mechanical construction and facilities services	1,113,417		1,097,240		954,633
United States building services	846,221		764,085		753,434
United States industrial services	832,034		772,899		850,434
Total United States operations	3,493,784		3,251,695		3,190,082
United Kingdom building services	146,379		131,806		105,081
Corporate administration	448,644		582,403		557,275
Total worldwide operations	$	4,088,807	$	3,965,904	$	3,852,438

During 2018, we recognized losses of $10.0 million on a transportation project within our United States electrical construction and facilities services segment, resulting in part from contract scope issues. During 2017, we recognized $18.1 million of gross profit associated with the recovery of certain contract costs previously disputed on a project completed in 2016 within our United States mechanical construction and facilities services segment. During 2016, we incurred $19.4 million of losses on a transportation project within our United States electrical construction and facilities services segment as a result of productivity issues attributable to unfavorable job-site conditions. Additionally during 2016, within the United States mechanical construction and facilities services segment, we incurred $18.3 million of losses on a project at a process facility as a result of a contract dispute with our customer and $9.6 million of losses on an institutional project due to project delays and unfavorable job-site conditions.