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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment
Property and equipment are summarized as follows (amounts in thousands):

 
As of December 31,
 
2017
 
2016
Construction equipment
$
118,868

 
$
121,441

Transportation equipment
17,511

 
19,017

Buildings
9,577

 
12,771

Office equipment
3,339

 
3,108

Leasehold improvement
914

 
914

Construction in progress
258

 
313

Land
2,348

 
3,509

Water rights
200

 
200

 
153,015

 
161,273

Less accumulated depreciation
(98,609
)
 
(93,146
)
 
$
54,406

 
$
68,127