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Property and equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment
Major classes of property and equipment consist of the following at December 31:  
 
 
2014
 
2013
Furniture and fixtures
 
$
2,488

 
$
2,405

Automobiles and trucks
 
13,721

 
14,053

Machinery and equipment
 
57,922

 
67,337

Office and computer equipment
 
18,305

 
14,452

Building and improvements
 
29,322

 
26,798

 
 
121,758

 
125,045

Less accumulated depreciation and amortization
 
64,310

 
64,350

 
 
57,448

 
60,695

Land
 
9,113

 
8,731

 
 
$
66,561

 
$
69,426


Property and equipment leased under capital leases, which are included in the above amounts, consist of the following at December 31:
 
 
2014
 
2013
Office and computer equipment
 
$
1,926

 
$
1,926

Machinery and equipment
 
642

 
642

 
 
2,568

 
2,568

Less accumulated depreciation and amortization
 
2,368

 
2,305

 
 
$
200

 
$
263