Goodwill (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill [Abstract]

Schedule of goodwill by reporting segment

The changes in the carrying amount of goodwill by reporting segment during the years ended December 31, 2015 and 2014 are as follows:

	Infrastructure Group			Aggregate and Mining Group			Energy Group		Corporate		Total
Balance, December 31, 2013	$	8,719		$	6,338		$	--	$	--	$	15,057
Acquisition		--			18,256			--		--		18,256
Foreign currency translation		(135	)		(1,183	)		--		--		(1,318	)
Balance, December 31, 2014		8,584			23,411			--		--		31,995
Purchase price adjustment		--			(178	)		--		--		(178	)
Foreign currency translation		(103	)		(879	)		--		--		(982	)
Balance, December 31, 2015	$	8,481		$	22,354		$	--	$	--	$	30,835