Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Summary of property and equipment

Automobiles and trucks	3 to 5 years
Buildings and improvements	5 to 30 years
Construction equipment	3 to 15 years
Vessels and other equipment	1 to 15 years
Office equipment	1 to 5 years

The following is a summary of property and equipment at December 31, 2018 and December 31, 2017:

	December 31, 2018			December 31, 2017
Automobiles and trucks	$	1,709		$	1,940
Building and improvements	43,628			38,062
Construction equipment	161,113			166,203
Vessels and other equipment	90,217			85,113
Office equipment	8,061			8,039
	304,728			299,357
Less: accumulated depreciation	(195,373		)	(191,407		)
Net book value of depreciable assets	109,355			107,950
Construction in progress	2,785			245
Land	35,863			38,083
	$	148,003		$	146,278