Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

	2012			2011			Useful Life
Land and buildings	$	24,358		$	18,987		30 years
Leasehold improvements	17,530			5,597			Lease life
Office equipment	2,092			1,203			3 - 5 years
Construction equipment	197,200			158,978			3 - 7 years
Transportation equipment	48,649			28,475			3 - 18 years
	289,829			213,240
Less: accumulated depreciation and amortization	(104,989		)	(83,591		)
Net property and equipment	$	184,840		$	129,649

- 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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