12. Segment Reporting

ASGN is a leading provider of IT and professional services in the technology, creative/digital, engineering and life sciences fields across commercial and government sectors. ASGN operates through its Apex, Oxford and ECS segments. The Apex Segment provides technical, scientific, digital and creative services and solutions to Fortune 1000 and mid-market clients across the United States and Canada. The businesses in this segment include Apex Systems, Apex Life Sciences and Creative Circle. The Oxford Segment provides "hard to find" technical, digital, engineering and life sciences resources and consulting services in select skill and geographic markets. The businesses in this segment include Oxford, CyberCoders and Life Sciences Europe. The ECS Segment delivers advanced solutions in cloud, cybersecurity, artificial intelligence, machine learning, software development, IT modernization and science and engineering and is primarily focused on federal government activities. ECS was acquired on April 2, 2018 (see Note 4. Acquisitions).

The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables is derived directly from the segments’ internal financial reporting used for corporate management purposes.

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):



	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Apex:
Revenues	$	589,717		$	517,492		$	1,695,728		$	1,502,462
Gross profit	177,831			155,783			506,146			445,925
Operating income	71,443			59,016			192,610			162,679
Amortization	6,546			7,194			19,638			21,983
Oxford:
Revenues	$	152,701		$	149,556		$	455,222		$	444,427
Gross profit	62,712			62,532			187,321			183,471
Operating income	15,156			16,088			39,794			39,525
Amortization	1,040			1,054			3,143			3,028
ECS:
Revenues	$	164,031		$	—		$	319,181		$	—
Gross profit	29,629			—			58,288			—
Operating income	4,314			—			8,012			—
Amortization	10,954			—			21,908			—
Corporate:
Operating loss⁽¹⁾	$	(16,616	)	$	(14,234	)	$	(54,745	)	$	(38,265	)
Consolidated:
Revenues	$	906,449		$	667,048		$	2,470,131		$	1,946,889
Gross profit	270,172			218,315			751,755			629,396
Operating income	74,297			60,870			185,671			163,939
Amortization	18,540			8,248			44,689			25,011

_____________


(1)	Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.

The following table presents our revenues disaggregated by type (in thousands):



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Apex:
Assignment	$	575,309	$	506,376	$	1,653,835	$	1,468,976
Permanent placement	14,408		11,116		41,893		33,486
	$	589,717	$	517,492	$	1,695,728	$	1,502,462
Oxford:
Assignment	$	130,365	$	127,963	$	386,068	$	379,892
Permanent placement	22,336		21,593		69,154		64,535
	$	152,701	$	149,556	$	455,222	$	444,427
ECS:
Firm-fixed-price	$	48,272	$	—	$	93,034	$	—
Time and materials	42,102		—		91,097		—
Cost-plus-fixed-fee	73,657		—		135,050		—
	$	164,031	$	—	$	319,181	$	—
Consolidated	$	906,449	$	667,048	$	2,470,131	$	1,946,889

The Company operates internationally, with operations mainly in the United States. The following table presents revenues by geographic location (in thousands):



	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2018		%		2017		%		2018		%		2017		%
Revenues:
Domestic	$	867,754	95.7	%	$	632,584	94.8	%	$	2,352,993	95.3	%	$	1,849,567	95.0	%
Foreign	38,695		4.3	%	34,464		5.2	%	117,138		4.7	%	97,322		5.0	%
	$	906,449	100.0	%	$	667,048	100.0	%	$	2,470,131	100.0	%	$	1,946,889	100.0	%