Business segment information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Schedule of Operating Segments Organized by Manufacturing Facilities and Include Three Reportable Segments

	Three months ended March 31,
	2012			2013
	(In thousands)
Net sales:
KSW	$	152,991		$	140,620
EWP		12,749			11,625
Calumet		7,442			7,107
Elimination of intersegment sales		(19,889	)		(16,578	)
Total net sales	$	153,293		$	142,774
Operating income (loss):
KSW	$	10,537		$	7,487
EWP		446			408
Calumet		(185	)		(776	)
Pension credit		1,899			3,696
OPEB credit		1,577			1,674
Other(1)		(1,948	)		(1,327	)
Total operating income		12,326			11,162
Non operating income (expense):
Interest expense		(360	)		(345	)
Other income (expense), net		(277	)		75
Income before income taxes	$	11,689		$	10,892

⁽¹⁾  Other items primarily consist of the elimination of intercompany profit or loss on ending inventory balances and general corporate expenses.