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Property and equipment
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment
Major classes of property and equipment consist of the following at December 31:  
 
 
2013
 
2012
Furniture and fixtures
 
$
2,405

 
$
2,327

Automobiles and trucks
 
14,053

 
13,618

Machinery and equipment
 
67,337

 
67,291

Office and computer equipment
 
14,452

 
10,603

Building and improvements
 
26,798

 
26,051

 
 
125,045

 
119,890

Less accumulated depreciation and amortization
 
64,350

 
55,356

 
 
60,695

 
64,534

Land
 
8,731

 
6,756

 
 
$
69,426

 
$
71,290


Property and equipment leased under capital leases, which are included in the above amounts, consist of the following at December 31:
 
 
2013
 
2012
Office and computer equipment
 
$
1,926

 
$
1,926

Machinery and equipment
 
642

 
642

 
 
2,568

 
2,568

Less accumulated depreciation and amortization
 
2,305

 
2,241

 
 
$
263

 
$
327