Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2011

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



December 31,	2011		2010
Land and land improvements	$	124,216	$	120,342
Quarry property	175,612		174,231
Buildings and leasehold improvements	81,272		85,655
Equipment and vehicles	733,158		778,443
Office furniture and equipment	55,570		42,509
Property and equipment	1,169,828		1,201,180
Less: accumulated depreciation and depletion	722,688		727,573
Property and equipment, net	$	447,140	$	473,607

Change in Asset Retirement Obligation

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



December 31,	2011			2010
Beginning balance	$	22,900		$	19,715
Revisions to estimates	(943		)	1,327
Liabilities incurred	471			1,217
Liabilities settled	(496		)	(628		)
Accretion	1,276			1,269
Ending balance	$	23,208		$	22,900

- 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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