Contracts in Progress (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 360,678	$ 343,524
Estimated earnings	47,208	64,358
Costs incurred and estimated earnings on uncompleted contracts	407,886	407,882
Less: Billings to date	(397,625)	(405,006)
Costs and estimated earnings in excess of billings on uncompleted contracts, net	10,261	2,876
Costs and estimated earnings in excess of billings on uncompleted contracts	24,856	19,245
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (14,595)	$ (16,369)