SEGMENT INFORMATION

The Company’s three reportable segments are Research Models and Services (RMS), Discovery and Safety Assessment (DSA), and Manufacturing Support (Manufacturing).

The following table presents revenue and other financial information by reportable segment:



	Three Months Ended
	March 30, 2019		March 31, 2018
	(in thousands)
RMS
Revenue	$	137,172	$	133,958
Operating income	37,832		38,527
Depreciation and amortization	4,322		4,853
Capital expenditures	4,112		4,625
DSA
Revenue	$	354,197	$	259,992
Operating income	46,705		40,859
Depreciation and amortization	33,784		20,787
Capital expenditures	8,848		12,802
Manufacturing
Revenue	$	113,200	$	100,020
Operating income	31,499		28,523
Depreciation and amortization	5,805		5,736
Capital expenditures	3,606		6,834

The following table presents reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	March 30, 2019			March 31, 2018			March 30, 2019		March 31, 2018		March 30, 2019		March 31, 2018
	(in thousands)
Three Months Ended:
Total reportable segments	$	116,036		$	107,909		$	43,911	$	31,376	$	16,566	$	24,261
Unallocated corporate	(46,244		)	(40,080		)	1,447		1,834		165		3,465
Total consolidated	$	69,792		$	67,829		$	45,358	$	33,210	$	16,731	$	27,726

Revenue for each significant product or service offering is as follows:



	Three Months Ended
	March 30, 2019		March 31, 2018
	(in thousands)
RMS	$	137,172	$	133,958
DSA	354,197		259,992
Manufacturing	113,200		100,020
Total revenue	$	604,569	$	493,970

A summary of unallocated corporate expense consists of the following:



	Three Months Ended
	March 30, 2019		March 31, 2018
	(in thousands)
Stock-based compensation	$	8,274	$	6,991
Compensation, benefits, and other employee-related expenses	22,038		20,596
External consulting and other service expenses	3,810		2,934
Information technology	2,723		2,465
Depreciation	1,447		1,834
Acquisition and integration	5,472		2,864
Other general unallocated corporate	2,480		2,396
Total unallocated corporate expense	$	46,244	$	40,080

Other general unallocated corporate expense consists of costs associated with departments such as senior executives, corporate accounting, legal, tax, human resources, treasury, and investor relations.

Revenue by geographic area is as follows:



	U.S.		Europe		Canada		Asia Pacific		Other		Consolidated
	(in thousands)
Three Months Ended:
March 30, 2019	$	350,176	$	166,365	$	53,979	$	33,179	$	870	$	604,569
March 31, 2018	248,980		160,826		48,578		34,520		1,066		493,970

Included in the Asia Pacific category above are operations located in China, Japan, Korea, Australia, Singapore, and India. Included in the Other category above are operations located in Brazil and Israel. Revenue represents sales originating in entities physically located in the identified geographic area.