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Fabrication Contracts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Costs, estimated earnings and billings on uncompleted contracts    
Costs incurred on uncompleted contracts $ 713,889 $ 1,133,835
Estimated earnings 109,494 195,742
Total cost incurred and estimated earnings on uncompleted contracts 823,383 1,329,577
Less - billings to date (794,133) (1,334,730)
Total cost and estimated earnings versus billings $ 29,250 $ (5,153)