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Fabrication Contracts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Costs, estimated earnings and billings on uncompleted contracts    
Costs incurred on uncompleted contracts $ 811,977exh_CostsIncurredOnUncompletedContracts $ 713,889exh_CostsIncurredOnUncompletedContracts
Estimated earnings 134,569exh_EstimatedEarningsOnUncompletedContracts 109,494exh_EstimatedEarningsOnUncompletedContracts
Total cost incurred and estimated earnings on uncompleted contracts 946,546exh_CostIncurredAndEstimatedEarningsOnUncompletedContracts 823,383exh_CostIncurredAndEstimatedEarningsOnUncompletedContracts
Less - billings to date (901,885)exh_BillingsToDateOnUncompletedContracts (794,133)exh_BillingsToDateOnUncompletedContracts
Total cost and estimated earnings versus billings $ 44,661exh_CostsAndEstimatedEarningsOnUncompletedContractsNet $ 29,250exh_CostsAndEstimatedEarningsOnUncompletedContractsNet