Description of the Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Description of the Business and Summary of Significant Accounting Policies

Schedule of accounts receivable, net

	As of December 31,
	2011			2010
Accounts receivable	$	137,084		$	135,962
Unbilled accounts receivable		50,165			44,392
Allowance for doubtful accounts		(4,782	)		(2,175	)
	$	182,467		$	178,179

Schedule of estimated useful lives of property and equipment

Item	Estimated Life in Years
Machinery and equipment	3 - 12
Transportation equipment	3 - 8
Furniture and fixtures	5 - 10
Buildings and improvements	15 - 40