Property and Equipment

12 Months Ended

Dec. 31, 2012

7. Property and Equipment

Property and equipment consisted of the following at December 31:

(dollars in thousands)	Estimated Useful Life in Years	2012			2011

Land	—	$	3,990		$	3,990
Buildings and improvements	3 to 39		13,096			12,392
Construction equipment	2 to 12		195,085			161,712
Office equipment	3 to 7		4,782			3,429

			216,953			181,523
Less: Accumulated depreciation and amortization			(88,042	)		(64,345	)

		$	128,911		$	117,178

Depreciation and amortization expense of property and equipment for the years ended December 31, 2012, 2011 and 2010 were $24.8 million, $19.2 million, and $16.0 million, respectively.

- Definition

The entire disclosure for 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. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

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