Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Dredging
Contract revenues	$	154,448		$	162,526		$	453,122		$	506,700
Operating income		5,553			19,598			26,762			45,587
Environmental & infrastructure
Contract revenues	$	44,565		$	60,451		$	103,437		$	131,929
Operating income (loss)		7,307			(9,906	)		(10,173	)		(29,164	)
Intersegment revenues	$	(144	)	$	(2,175	)	$	(2,379	)	$	(4,393	)
Total
Contract revenues	$	198,869		$	220,802		$	554,180		$	634,236
Operating income		12,860			9,692			16,589			16,423