10. Segment Reporting

On Assignment provides services through two operating segments with each addressing different sectors of the professional staffing market with distinct business models attuned to those sectors. The Apex Segment provides a broad spectrum of technical, scientific, digital and creative professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States and Canada. Businesses in this segment include Apex Systems, Apex Life Sciences and Creative Circle. The Oxford Segment provides specialized staffing, permanent placement and consulting services in select skill and geographic markets. Businesses in this segment include Oxford Global Resources, CyberCoders and Life Sciences Europe.

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 internal financial reports used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information and such information is not readily available. Accordingly, assets by reportable segment are not disclosed.

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



	Three Months Ended									Three Months Ended
	June 30, 2017									June 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	502,455	$	150,858	$	—		$	653,313	$	453,723	$	154,365	$	—		$	608,088
Gross profit	150,223		62,714		—			212,937		138,165		63,921		—			202,086
Operating income	56,770		14,774		(12,083		)	59,461		50,190		13,856		(13,342		)	50,704
Amortization	7,262		1,037		—			8,299		8,590		1,442		—			10,032



	Six Months Ended									Six Months Ended
	June 30, 2017									June 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	984,970	$	294,871	$	—		$	1,279,841	$	886,878	$	303,250	$	—		$	1,190,128
Gross profit	290,142		120,939		—			411,081		264,309		125,559		—			389,868
Operating income	103,663		23,437		(24,031		)	103,069		90,176		26,616		(28,331		)	88,461
Amortization	14,789		1,974		—			16,763		17,180		2,996		—			20,176


(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 revenues by type (in thousands):



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Assignment	$	620,014	94.9	%	$	574,323	94.4	%	$	1,214,529	94.9	%	$	1,123,875	94.4	%
Permanent placement	33,299		5.1	%	33,765		5.6	%	65,312		5.1	%	66,253		5.6	%
	$	653,313	100.0	%	$	608,088	100.0	%	$	1,279,841	100.0	%	$	1,190,128	100.0	%

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



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Domestic	$	620,682	95.0	%	$	578,165	95.1	%	$	1,216,983	95.1	%	$	1,132,603	95.2	%
Foreign	32,631		5.0	%	29,923		4.9	%	62,858		4.9	%	57,525		4.8	%
	$	653,313	100.0	%	$	608,088	100.0	%	$	1,279,841	100.0	%	$	1,190,128	100.0	%