Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment and Asset Retirement Obligation [Abstract]



December 31,	2012		2011
Land and land improvements	$	125,961	$	124,216
Quarry property	180,567		175,612
Buildings and leasehold improvements	83,245		81,272
Equipment and vehicles	758,782		733,158
Office furniture and equipment	67,743		55,570
Property and equipment	1,216,298		1,169,828
Less: accumulated depreciation and depletion	734,820		722,688
Property and equipment, net	$	481,478	$	447,140

Change in Asset Retirement Obligation

The following is a reconciliation of these asset retirement obligations (in thousands):



December 31,	2012			2011
Beginning balance	$	23,208		$	22,900
Revisions to estimates	2,810			(943		)
Liabilities incurred	154			471
Liabilities settled	(885		)	(496		)
Accretion	1,289			1,276
Ending balance	$	26,576		$	23,208

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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