Segment Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
Dredging
Contract revenues	$	162,526		$	167,079		$	506,700		$	486,153
Operating income		19,598			5,733			45,587			24,157
Environmental & remediation
Contract revenues	$	60,451		$	37,182		$	131,929		$	79,224
Operating income (loss)		(9,906	)		2,274			(29,164	)		(2,996	)
Intersegment revenues	$	(2,175	)	$	(2,063	)		(4,393	)		(4,088	)
Total
Contract revenues	$	220,802		$	202,198		$	634,236		$	561,289
Operating income		9,692			8,007			16,423			21,161