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Costs incurred and estimated earnings net of billings on uncompleted contracts | 12 Months Ended
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Dec. 31, 2017
Contractors [Abstract] |
Costs incurred and estimated earnings net of billings on uncompleted contracts | Costs incurred and estimated earnings net of billings on uncompleted contracts
|  | December 31, 2017 |  |  | December 31, 2016 |
Costs incurred and estimated earnings on uncompleted contracts |  | $ | 199,863 |  |  | $ | 208,030 |
Less billings to date |  | (179,800 | ) |  | (193,136 | )
|  | $ | 20,063 |  |  | $ | 14,894 |
Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
|  | December 31, 2017 |  |  | December 31, 2016 |
Unbilled revenue |  | $ | 21,572 |  |  | $ | 15,965 |
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | (824 | ) |  | (1,071 | )
|  | $ | 20,748 |  |  | $ | 14,894 |
Unbilled revenue related to non-construction activities amounted to $685 (December 31, 2016 - $nil).

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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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