Industry Segment and Geographic Areas (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Information Regarding Revenues and Assets by Geographic Area

Information regarding revenues by geographic area is as follows:

	2018		2017		2016
	(In thousands)
Revenues:
United States	$	374,650	$	355,768	$	347,853
Foreign:
Asia		9,081		9,133		6,539
Canada		11,893		10,407		12,587
Europe		20,147		15,718		15,299
Mexico		3,603		3,601		3,460
Middle East		11,318		4,904		5,520
Other		3,040		2,909		2,503
Total	$	433,732	$	402,440	$	393,761

Information regarding assets by geographic area is as follows:

	2018		2017
	(In thousands)
Long-lived assets:
United States	$	54,904	$	56,980
Foreign:
Europe		15,247		15,806
Mexico		20,170		20,815
Total	$	90,321	$	93,601

	2018		2017
	(In thousands)
Total assets:
United States	$	293,943	$	300,688
Foreign:
Europe		74,707		66,862
Mexico		24,041		24,177
Total	$	392,691	$	391,727