Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment and Asset Retirement Obligation [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 consolidated balance sheets as follows (in thousands):

December 31,	2013		2012
Equipment and vehicles	$	765,971	$	758,782
Quarry property	170,442		180,567
Land and land improvements	119,917		125,961
Buildings and leasehold improvements	83,494		83,245
Office furniture and equipment	70,156		67,743
Property and equipment	1,209,980		1,216,298
Less: accumulated depreciation and depletion	773,121		734,820
Property and equipment, net	$	436,859	$	481,478

Change in Asset Retirement Obligation

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

Years Ended December 31,	2013			2012
Beginning balance	$	26,576		$	23,208
Revisions to estimates	2,265			2,810
Liabilities incurred	83			154
Liabilities settled	(976		)	(885		)
Accretion	1,190			1,289
Ending balance	$	29,138		$	26,576