Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Summary of property and equipment

Depreciation is computed using the straight-line method over the estimated useful lives of the related assets for financial statement purposes, as follows:

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, 2015 and December 31, 2014:

	December 31, 2015			December 31, 2014
Automobiles and trucks	$	2,749		$	2,006
Building and improvements	28,226			28,641
Construction equipment	159,963			146,088
Vessels and other equipment	89,485			96,275
Office equipment	6,057			4,891
	286,480			277,901
Less: accumulated depreciation	(164,371		)	(161,276		)
Net book value of depreciable assets	122,109			116,625
Construction in progress	5,649			5,274
Land	38,231			39,874
	$	165,989		$	161,773