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Contracts in Process (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Net liability position for contracts in process |  |
Costs and estimated earnings on uncompleted contracts | $ 1,776,835 | $ 1,748,204
Less: Billings to date | 1,777,950 | 1,760,637
Net costs and estimated earnings in excess of billings | (1,115) | (12,433)
Net liability position for contracts in process included in consolidated balance sheets |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 47,637 | 40,519
Billings in excess of costs and estimated earnings on uncompleted contracts | (48,752) | (52,952)
Net costs and estimated earnings in excess of billings | $ (1,115) | $ (12,433)

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