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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property and Equipment  
Summary of property and equipment

The following is a summary of property and equipment at December 31 (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

    

2018

    

2017

    

Useful Life

 

Land and buildings

 

$

101,170

 

$

82,755

 

Buildings 30 Years

 

Leasehold improvements

 

 

13,438

 

 

12,601

 

Various*

 

Office equipment

 

 

9,669

 

 

8,888

 

3 - 5 Years

 

Construction equipment

 

 

439,875

 

 

392,454

 

3 - 7 Years

 

Transportation equipment

 

 

112,170

 

 

101,855

 

3 - 18 Years

 

Solar equipment

 

 

21,304

 

 

 —

 

25 years

 

Construction in progress

 

 

35,094

 

 

16,336

 

 

 

 

 

 

732,720

 

 

614,889

 

 

 

Less: accumulated depreciation and amortization

 

 

(356,836)

 

 

(303,112)

 

 

 

Property and equipment, net

 

$

375,884

 

$

311,777

 

 

 

*     Leasehold improvements are depreciated over the shorter of the life of the leasehold improvement or the lease term