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Property and Equipment, Net (Tables)
9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property and Equipment
Balances of major classes of assets and allowances for depreciation and depletion are included in property and equipment, net on our condensed consolidated balance sheets as follows:
(in thousands)
 
September 30,
2013
 
December 31,
2012
 
September 30,
2012
Equipment and vehicles
 
$
754,598

 
$
758,782

 
$
718,965

Quarry property
 
180,205

 
180,567

 
177,814

Land and land improvements
 
125,606

 
125,961

 
125,842

Buildings and leasehold improvements
 
83,743

 
83,245

 
80,916

Office furniture and equipment
 
69,265

 
67,743

 
64,767

Property and equipment
 
1,213,417

 
1,216,298

 
1,168,304

Less: accumulated depreciation and depletion
 
756,893

 
734,820

 
736,011

Property and equipment, net
 
$
456,524

 
$
481,478

 
$
432,293