Segment Information (Tables)

6 Months Ended

Jun. 30, 2016

Segment Information [Abstract]

Segment information

The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies. Intersegment sales and transfers are valued at prices comparable to those for unrelated parties.

Segment Information:

	Three Months Ended June 30, 2016
	Infrastructure Group			Aggregateand Mining Group			Energy Group			Corporate			Total
Net sales to external   customers	$	152,476		$	99,085		$	42,833		$	-		$	294,394
Intersegment sales		4,511			5,945			6,144			-			16,600
Gross profit		36,583			26,141			10,514			214			73,452
Gross profit percent		24.0	%		26.4	%		24.5	%		-			25.0	%
Segment profit (loss)	$	19,673		$	10,947		$	2,626		$	(14,912	)	$	18,334

	Six Months Ended June 30, 2016
	Infrastructure Group			Aggregateand Mining Group			Energy Group			Corporate			Total
Net sales to external   customers	$	305,590		$	191,573		$	75,953		$	-		$	573,116
Intersegment sales		7,684			10,796			9,610			-			28,090
Gross profit		76,420			51,289			17,596			103			145,408
Gross profit percent		25.0	%		26.8	%		23.2	%		-			25.4	%
Segment profit (loss)	$	41,536		$	20,485		$	2,433		$	(29,137	)	$	35,317

	Three Months Ended June 30, 2015
	Infrastructure Group			Aggregateand Mining Group			Energy Group			Corporate			Total
Net sales to external   customers	$	116,097		$	98,829		$	53,116		$	--		$	268,042
Intersegment sales		6,690			3,935			5,366			--			15,991
Gross profit		27,242			24,985			9,998			8			62,233
Gross profit percent		23.5	%		25.3	%		18.8	%		--			23.2	%
Segment profit (loss)	$	11,845		$	10,056		$	701		$	(10,334	)	$	12,268

	Six Months Ended June 30, 2015
	Infrastructure Group			Aggregateand Mining Group			Energy Group			Corporate			Total
Net sales to external   customers	$	251,143		$	205,241		$	100,407		$	--		$	556,791
Intersegment sales		11,794			14,619			12,843			--			39,256
Gross profit		58,188			50,957			19,117			17			128,279
Gross profit percent		23.2	%		24.8	%		19.0	%		--			23.0	%
Segment profit (loss)	$	27,356		$	21,650		$	864		$	(22,300	)	$	27,570

Schedule of segment profits to the Company's consolidated totals

A reconciliation of total segment profits to the Company's consolidated totals is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Total segment profits	$	18,334		$	12,268		$	35,317		$	27,570
Recapture (elimination) of intersegment profit		(193	)		(610	)		502			(996	)
Net income		18,141			11,658			35,819			26,574
Net loss attributable to non-controlling   interest in subsidiaries		(51	)		(147	)		(116	)		(335	)
Net income attributable to controlling interest	$	18,192		$	11,805		$	35,935		$	26,909