Description of Business and Summary of Significant Accounting Policies (Details 3) (USD $)			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum
Significant Accounting Policies
Span of larger contracts			2 years	6 years
Costs and estimated earnings in excess of billings
Unbilled costs and profits incurred to date	$ 204,276,000	$ 157,119,000
Unapproved change orders	146,787,000	141,596,000
Claims	222,185,000	166,287,000
Costs and estimated earnings in excess of billings	573,248,000	465,002,000
Unapproved change orders and claims subject to pending litigation	58,800,000	62,000,000
Costs and estimated earnings in excess of billings beyond one year	$ 235,600,000