Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2015

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,	2015		2014
Equipment and vehicles	$	731,224	$	767,313
Quarry property	178,357		172,081
Land and land improvements	110,294		110,235
Buildings and leasehold improvements	82,871		82,655
Office furniture and equipment	60,821		70,820
Property and equipment	1,163,567		1,203,104
Less: accumulated depreciation and depletion	778,438		793,451
Property and equipment, net	$	385,129	$	409,653

Change in Asset Retirement Obligation

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

Years Ended December 31,	2015			2014
Beginning balance	$	27,441		$	29,138
Revisions to estimates	213			2,969
Liabilities settled	(2,114		)	(5,678		)
Accretion	1,018			1,012
Ending balance	$	26,558		$	27,441