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Contracts in Process (Tables) | 12 Months Ended
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Dec. 31, 2017
Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block] | The net asset position for contracts in process consisted of the following at December 31:
(in thousands) |  | 2017 |  | 2016
Costs and estimated earnings on uncompleted contracts |  | $ | 1,978,981 |  |  | $ | 2,194,695 |
Less: Billings to date |  |  | 1,929,640 |  |  |  | 2,167,066 |
|  | $ | 49,341 |  |  | $ | 27,629 |
Consolidated Balance Sheet [Member] |
Costs in Excess of Billings and Billings in Excess of Costs [Table Text Block] | The net asset position for contracts in process is included in the accompanying consolidated balance sheets as follows at December 31:
(in thousands) |  | 2017 |  | 2016
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 78,260 |  |  | $ | 69,950 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (28,919 | ) |  |  | (42,321 | )
|  | $ | 49,341 |  |  | $ | 27,629

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- Definition Tabular disclosure for billings on uncompleted contracts in excess of costs and costs of uncompleted contracts in excess of billings. + References No definition available. + Details
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