Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2014

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 the consolidated balance sheets as follows (in thousands):

December 31,	2014		2013
Equipment and vehicles	$	767,313	$	765,971
Quarry property	172,081		170,442
Land and land improvements	110,235		119,917
Buildings and leasehold improvements	82,655		83,494
Office furniture and equipment	70,820		70,156
Property and equipment	1,203,104		1,209,980
Less: accumulated depreciation and depletion	793,451		773,121
Property and equipment, net	$	409,653	$	436,859

Change in Asset Retirement Obligation

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

Years Ended December 31,	2014			2013
Beginning balance	$	29,138		$	26,576
Revisions to estimates	2,969			2,265
Liabilities incurred	—			83
Liabilities settled	(5,678		)	(976		)
Accretion	1,012			1,190
Ending balance	$	27,441		$	29,138