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Property and Equipment
 12 Months Ended
Dec. 31, 2018
Property and Equipment  
Property and Equipment

6. Property and Equipment

Property and equipment consist of the following (dollars in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

 

    

Useful Lives

    

December 31,

 

 

    

in Years

    

2018

    

2017

 

Land

 

 —

 

$

5,702

 

$

2,745

 

Transportation equipment

 

1 - 7

 

 

98,898

 

 

87,120

 

Machinery and equipment

 

1 - 20

 

 

33,907

 

 

30,064

 

Computer and telephone equipment

 

1 - 10

 

 

20,179

 

 

20,463

 

Buildings and leasehold improvements

 

1 - 40

 

 

53,559

 

 

38,422

 

Furniture and fixtures

 

1 - 17

 

 

4,879

 

 

4,473

 

Construction in progress

 

 —

 

 

1,715

 

 

12,614

 

 

 

 

 

 

218,839

 

 

195,901

 

Less—Accumulated depreciation

 

 

 

 

(119,221)

 

 

(108,310)

 

Property and equipment, net

 

 

 

$

99,618

 

$

87,591

 

 

Depreciation expense, including capital lease amortization, for the years ended December 31, 2018,  2017 and 2016 was $22.6 million, $20.1 million and $18.0 million, respectively.