Industry Segment and Geographic Areas (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Information regarding revenues by geographic area is as follows:

	2014		2013		2012
	(In thousands)
Revenues:
United States	$	309,651	$	290,019	$	271,045
Foreign:
Asia	10,647		8,085		10,075
Canada	12,092		8,514		8,752
Europe	19,448		15,677		16,001
Mexico	3,941		4,226		6,636
Middle East	6,221		1,604		2,232
Other	2,768		5,997		4,919
Total	$	364,768	$	334,122	$	319,660

Information regarding assets by geographic area is as follows:

	2014		2013
	(In thousands)
Long-lived assets (all non-current assets):
United States	$	162,368	$	150,997
Foreign:
Europe	16,273		17,409
Mexico	21,412		20,489
Total	$	200,053	$	188,895
	2014		2013
	(In thousands)
Total assets:
United States	$	278,094	$	255,881
Foreign:
Europe	38,453		36,838
Mexico	24,611		23,339
Total	$	341,158	$	316,058