Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Segment Information [Abstract]

Segment Reporting Information, by Segment

Segment information for the three months ended March 31, 2017 and April 1, 2016 follows:

Revenues
	Three Months Ended
(In thousands)	March 31, 2017		April 1, 2016
Engineering and Other Scientific	$	66,683	$	64,810
Environmental and Health		17,439		18,346
Total revenues	$	84,122	$	83,156

Operating Income
	Three Months Ended
(In thousands)	March 31, 2017		April 1, 2016
Engineering and Other Scientific	$	22,321	$	21,138
Environmental and Health		5,479		5,195
Total segment operating income		27,800		26,333
Corporate operating expense		(13,166)		(9,897)
Total operating income	$	14,634	$	16,436

Capital Expenditures
	Three Months Ended
(In thousands)	March 31, 2017		April 1, 2016
Engineering and Other Scientific	$	1,008	$	1,190
Environmental and Health		42		23
Total segment capital expenditures		1,050		1,213
Corporate capital expenditures		257		268
Total capital expenditures	$	1,307	$	1,481

Depreciation and Amortization
	Three Months Ended
(In thousands)	March 31, 2017		April 1, 2016
Engineering and Other Scientific	$	1,115	$	1,021
Environmental and Health		41		43
Total segment depreciation and amortization		1,156		1,064
Corporate depreciation and amortization		410		339
Total depreciation and amortization	$	1,566	$	1,403