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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

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