PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2016

Property Plant And Equipment [Abstract]

Summary of Property Plant Equipment by Asset Category

A summary of property, plant and equipment by asset category is as follows:

	December 31, 2016			December 31, 2015
	(In thousands)
Marine Vessels	$	1,789,942		$	1,391,556
Construction Equipment		474,128			478,175
Buildings		152,584			155,292
All other		148,805			143,580
Construction in Progress		20,720			298,749
Total Cost	$	2,586,179		$	2,467,352
Accumulated Depreciation		(898,878	)		(856,493	)
Net Book Value	$	1,687,301		$	1,610,859