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Discontinued operations Discontinued operations (Tables) | 12 Months Ended
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Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract] |
Schedule of distribution of discontinued operations |
Year ended December 31, |  | 2013
|  | Pipeline |  |  | Piling |  |  | Total |
Revenue |  | $ | — |  |  | $ | 98,735 |  |  | $ | 98,735 |
Project costs |  | 1,321 |  |  | 79,472 |  |  | 80,793 |
Equipment costs |  | — |  |  | 1,242 |  |  | 1,242 |
Depreciation |  | — |  |  | 706 |  |  | 706 |
Gross (loss) profit |  | $ | (1,321 | ) |  | $ | 17,315 |  |  | $ | 15,994 |
General and administrative expenses |  | 312 |  |  | 6,857 |  |  | 7,169 |
Loss (gain) on disposal of assets and liabilities |  | 63 |  |  | (98,065 | ) |  | (98,002 | )
Gain on sale of inventory |  | (46 | ) |  | — |  |  | (46 | )
Amortization of intangible assets |  | — |  |  | 351 |  |  | 351 |
Operating (loss) income |  | $ | (1,650 | ) |  | $ | 108,172 |  |  | $ | 106,522 |
Interest expense |  | — |  |  | 4,758 |  |  | 4,758 |
(Loss) income before income taxes |  | $ | (1,650 | ) |  | $ | 103,414 |  |  | $ | 101,764 |
Current income tax expense |  | — |  |  | 164 |  |  | 164 |
Deferred income tax (benefit) expense |  | (510 | ) |  | 14,879 |  |  | 14,369 |
Net (loss) income |  | $ | (1,140 | ) |  | $ | 88,371 |  |  | $ | 87,231 |
Cash (used in) provided by discontinued operations during the prior year are summarized as follows:
Year ended December 31, |  | 2013
|  | Pipeline |  |  | Piling |  |  | Total |
Operating activities |  | $ | (1,587 | ) |  | $ | 47,326 |  |  | $ | 45,739 |
Investing activities |  | — |  |  | 182,836 |  |  | 182,836 |
Financing activities |  | — |  |  | (271 | ) |  | (271 | )
|  | $ | (1,587 | ) |  | $ | 229,891 |  |  | $ | 228,304 |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721665-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1474-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=51719941&loc=SL51724579-110230 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721663-107760 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721659-107760 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721671-107760 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721677-107760 + Details
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