Segment Reporting (Tables)

9 Months Ended

Sep. 28, 2018

Segment Reporting [Abstract]

Segment Reporting Information, by Segment

Segment information for the three and nine months ended September 28, 2018 and September 29, 2017 follows:

Revenues
	Three Months Ended				Nine Months Ended
(In thousands)	September 28,  2018		September 29,  2017		September 28,  2018		September 29,  2017
Engineering and Other Scientific	$	77,853	$	70,670	$	231,980	$	207,148
Environmental and Health		17,449		16,885		55,400		52,369
Total revenues	$	95,302	$	87,555	$	287,380	$	259,517

Operating Income
	Three Months Ended						Nine Months Ended
(In thousands)	September 28, 2018			September 29, 2017			September 28, 2018			September 29, 2017
Engineering and Other Scientific	$	25,784		$	23,645		$	77,499		$	70,279
Environmental and Health		5,401			5,450			18,181			16,753
Total segment operating income		31,185			29,095			95,680			87,032
Corporate operating expense		(10,591	)		(9,790	)		(31,010	)		(32,776	)
Total operating income	$	20,594		$	19,305		$	64,670		$	54,256

Capital Expenditures
	Three Months Ended				Nine Months Ended
(In thousands)	September 28, 2018		September 29, 2017		September 28, 2018		September 29, 2017
Engineering and Other Scientific	$	1,878	$	662	$	3,982	$	2,464
Environmental and Health		43		64		141		170
Total segment capital expenditures		1,921		726		4,123		2,634
Corporate capital expenditures		2,795		102		9,542		720
Total capital expenditures	$	4,716	$	828	$	13,665	$	3,354

Depreciation and Amortization
	Three Months Ended				Nine Months Ended
(In thousands)	September 28, 2018		September 29, 2017		September 28, 2018		September 29, 2017
Engineering and Other Scientific	$	1,102	$	1,103	$	3,318	$	3,381
Environmental and Health		44		47		124		132
Total segment depreciation and amortization		1,146		1,150		3,442		3,513
Corporate depreciation and amortization		415		417		1,268		1,249
Total depreciation and amortization	$	1,561	$	1,567	$	4,710	$	4,762