12. Segment Reporting

ASGN Incorporated 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						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Apex:
Revenues	$	567,507		$	502,455		$	1,106,011		$	984,970
Gross profit	169,667			150,223			328,315			290,142
Operating income	64,903			56,770			121,167			103,663
Amortization	6,546			7,262			13,092			14,789
Oxford:
Revenues	$	155,852		$	150,858		$	302,521		$	294,871
Gross profit	65,520			62,714			124,609			120,939
Operating income	14,812			14,774			24,638			23,437
Amortization	1,048			1,037			2,103			1,974
ECS:
Revenues	$	155,150		$	—		$	155,150		$	—
Gross profit	28,659			—			28,659			—
Operating income	3,698			—			3,698			—
Amortization	10,954			—			10,954			—
Corporate:
Operating income⁽¹⁾	$	(17,731	)	$	(12,083	)	$	(38,129	)	$	(24,031	)
Consolidated:
Revenues	$	878,509		$	653,313		$	1,563,682		$	1,279,841
Gross profit	263,846			212,937			481,583			411,081
Operating income	65,682			59,461			111,374			103,069
Amortization	18,548			8,299			26,149			16,763

_____________


(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				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Apex
Assignment	$	553,672	$	491,334	$	1,078,526	$	962,600
Permanent placement	13,835		11,121		27,485		22,370
	$	567,507	$	502,455	$	1,106,011	$	984,970
Oxford
Assignment	$	130,301	$	128,680	$	255,703	$	251,929
Permanent placement	25,551		22,178		46,818		42,942
	$	155,852	$	150,858	$	302,521	$	294,871
ECS
Firm-fixed-price	$	44,762	$	—	$	44,762	$	—
Time and materials	48,995		—		48,995		—
Cost-plus-fixed-fee	61,393		—		61,393		—
	$	155,150	$	—	$	155,150	$	—
Consolidated	$	878,509	$	653,313	$	1,563,682	$	1,279,841

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



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2018		%		2017		%		2018		%		2017		%
Revenues:
Domestic	$	837,972	95.4	%	$	620,682	95.0	%	$	1,485,239	95.0	%	$	1,216,983	95.1	%
Foreign	40,537		4.6	%	32,631		5.0	%	78,443		5.0	%	62,858		4.9	%
	$	878,509	100.0	%	$	653,313	100.0	%	$	1,563,682	100.0	%	$	1,279,841	100.0	%