Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule Of Goodwill

The change in the carrying amount of goodwill during the years ended December 31, 2017 and 2016 is as follows:

	Dredging Segment		Environmental & Infrastructure Segment			Total
Balance - January 1, 2015	$	76,576	$	9,750		$	86,326
Impairment of goodwill		—		(2,750	)		(2,750	)
Balance - December 31, 2016		76,576		7,000			83,576
Balance - December 31, 2017	$	76,576	$	7,000		$	83,576

Net Book Value Of Identifiable Intangible Assets

At December 31, 2017 and 2016, the net book value of identifiable intangible assets was as follows:

As of December 31, 2017	Cost		Accumulated Amortization		Net
Non-compete agreements	$	2,377	$	1,753	$	624
Other		781		497		284
	$	3,158	$	2,250	$	908
As of December 31, 2016
Non-compete agreements	$	2,377	$	1,317	$	1,060
Other		781		342		439
	$	3,158	$	1,659	$	1,499