Industry Segment and Geographic Areas (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Information Regarding Revenues and Assets by Geographic Area

Information regarding revenues by geographic area is as follows:

	2017		2016		2015
	(In thousands)
Revenues:
United States	$	355,768	$	347,853	$	322,535
Foreign:
Asia	9,133		6,539		8,299
Canada	10,407		12,587		9,095
Europe	15,718		15,299		17,036
Mexico	3,601		3,460		8,889
Middle East	4,904		5,520		9,672
Other	2,909		2,503		2,172
Total	$	402,440	$	393,761	$	377,698

Information regarding assets by geographic area is as follows:

	2017		2016
	(In thousands)
Long-lived assets:
United States	$	56,980	$	53,454
Foreign:
Europe	15,806		15,694
Mexico	20,815		21,046
Total	$	93,601	$	90,194
	2017		2016
	(In thousands)
Total assets:
United States	$	300,688	$	287,081
Foreign:
Europe	66,862		38,579
Mexico	24,177		24,039
Total	$	391,727	$	349,699