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Contracts in Process | 12 Months Ended
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Dec. 31, 2017
Contractors [Abstract] |
Long-term Contracts or Programs Disclosure [Text Block] | 5. Contracts in Process 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 |
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 The entire disclosure for long-term contracts or programs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -URI http://asc.fasb.org/subtopic&trid=2197326 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -URI http://asc.fasb.org/topic&trid=2145070 + Details
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