Industry Segment and Geographic Areas (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Schedule of Information Regarding Revenues and Assets by Geographic Area

Information regarding revenues by geographic area is as follows:

	2016		2015		2014
	(In thousands)
Revenues:
United States	$	347,853	$	322,535	$	309,651
Foreign:
Asia	6,539		8,299		10,647
Canada	12,587		9,095		12,092
Europe	15,299		17,036		19,448
Mexico	3,460		8,889		3,941
Middle East	5,520		9,672		6,221
Other	2,503		2,172		2,768
Total	$	393,761	$	377,698	$	364,768

Information regarding assets by geographic area is as follows:

	2016		2015
	(In thousands)
Long-lived assets:
United States	$	53,454	$	53,615
Foreign:
Europe	15,694		15,676
Mexico	21,046		21,629
Total	$	90,194	$	90,920
	2016		2015
	(In thousands)
Total assets:
United States	$	287,081	$	289,447
Foreign:
Europe	38,579		40,813
Mexico	24,039		25,220
Total	$	349,699	$	355,480