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Fabrication Contracts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Costs, estimated earnings and billings on uncompleted contracts    
Costs incurred on uncompleted contracts $ 1,133,835 $ 895,337
Estimated earnings 195,742 157,893
Total cost incurred and estimated earnings on uncompleted contracts 1,329,577 1,053,230
Less - billings to date (1,334,730) (1,014,977)
Total Cost and Estimated Earnings Versus Billings $ (5,153) $ 38,253