Segment Reporting (Tables)

9 Months Ended

Sep. 27, 2019

Segment Reporting [Abstract]

Segment Reporting Information, by Segment

Segment information for the three and nine months ended September 27, 2019 and September 28, 2018 follows:

Revenues

	Three Months Ended				Nine Months Ended
(In thousands)	September 27, 2019		September 28, 2018		September 27, 2019		September 28, 2018
Engineering and Other Scientific	$	83,060	$	77,853	$	250,134	$	231,980
Environmental and Health		18,488		17,449		56,951		55,400
Total revenues	$	101,548	$	95,302	$	307,085	$	287,380

Operating Income

	Three Months Ended						Nine Months Ended
(In thousands)	September 27, 2019			September 28, 2018			September 27, 2019			September 28, 2018
Engineering and Other Scientific	$	27,925		$	25,784		$	83,151		$	77,499
Environmental and Health		6,175			5,401			19,410			18,181
Total segment operating income		34,100			31,185			102,561			95,680
Corporate operating expense		(10,916	)		(10,591	)		(38,800	)		(31,010	)
Total operating income	$	23,184		$	20,594		$	63,761		$	64,670

Capital Expenditures

	Three Months Ended				Nine Months Ended
(In thousands)	September 27, 2019		September 28, 2018		September 27, 2019		September 28, 2018
Engineering and Other Scientific	$	664	$	1,878	$	3,371	$	3,982
Environmental and Health		17		43		73		141
Total segment capital expenditures		681		1,921		3,444		4,123
Corporate capital expenditures		4,197		2,795		14,675		9,542
Total capital expenditures	$	4,878	$	4,716	$	18,119	$	13,665

Depreciation and Amortization

	Three Months Ended				Nine Months Ended
(In thousands)	September 27, 2019		September 28, 2018		September 27, 2019		September 28, 2018
Engineering and Other Scientific	$	1,179	$	1,102	$	3,470	$	3,318
Environmental and Health		55		44		148		124
Total segment depreciation and    amortization		1,234		1,146		3,618		3,442
Corporate depreciation and amortization		438		415		1,286		1,268
Total depreciation and amortization	$	1,672	$	1,561	$	4,904	$	4,710