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Other information (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract] |
Schedule of supplemental cash flow information | Supplemental cash flow information
Year ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Cash paid during the year for: |  |  |  |  |  |
Interest |  | $ | 9,187 |  |  | $ | 10,939 |  |  | $ | 25,528 |
Income taxes |  | — |  |  | — |  |  | 91 |
Cash received during the year for: |  |  |  |  |  |
Interest |  | 208 |  |  | 63 |  |  | 256 |
Income taxes |  | — |  |  | 88 |  |  | 3,797 |
Schedule of non-cash transactions |
Year ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Non-cash transactions: |  |  |  |  |  |
Addition of plant and equipment by means of capital leases |  | $ | 20,058 |  |  | $ | 39,492 |  |  | $ | 13,812 |
Reclass from plant and equipment to assets held for sale |  | (1,566 | ) |  | (1,321 | ) |  | (5,123 | )
Non-cash working capital exclusions: |  |  |  |  |  |
Decrease in inventory resulting from reclassification to plant and equipment |  | (1,128 | ) |  | — |  |  | — |
Net increase in accounts receivable related to sale of plant and equipment |  | (3,600 | ) |  | — |  |  | — |
Net (decrease) increase in accounts payable related to purchase of plant and equipment |  | (3,197 | ) |  | 283 |  |  | 2,931 |
Net decrease in accounts payable related to change in estimated financing costs |  | — |  |  | (101 | ) |  | — |
Net (decrease) increase in accounts payable related to change in the lease inducement payable on the sublease |  | (107 | ) |  | 107 |  |  | — |
Net decrease in short term portion of equipment lease liabilities included in accrued liabilities related to the purchase of plant and equipment |  | — |  |  | — |  |  | (159 | )
Net increase in long term portion of equipment lease liabilities related to the purchase of plant and equipment |  | — |  |  | — |  |  | 1,702 |
Increase in accrued liabilities related to the current portion of the deferred gain on sale leaseback |  | 128 |  |  | — |  |  | — |
Net (decrease) increase in accrued liabilities related to current portion of RSU liability |  | (338 | ) |  | (924 | ) |  | 1,430 |
Net decrease in accrued liabilities related to current portion of DSU liability |  | (408 | ) |  | (408 | ) |  | (253 | )
Net (decrease) increase in accrued liabilities related to the current portion of the senior executive stock options |  | (22 | ) |  | 22 |  |  | — |
Net (decrease) increase in accrued liabilities related to dividend payable |  | (697 | ) |  | 697 |  |  | — |
Schedule of net change in non-cash working capital | Net change in non-cash working capital
Year ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Operating activities: |  |  |  |  |  |
Accounts receivable |  | $ | 45,367 |  |  | $ | 3,674 |  |  | $ | 29,765 |
Unbilled revenue |  | 26,057 |  |  | (11,454 | ) |  | 30,275 |
Inventories |  | 3,746 |  |  | (1,542 | ) |  | (644 | )
Prepaid expenses and deposits |  | 690 |  |  | (780 | ) |  | 634 |
Accounts payable |  | (29,751 | ) |  | 9,928 |  |  | (31,847 | )
Accrued liabilities |  | (6,892 | ) |  | (954 | ) |  | (1,603 | )
Long term portion of liabilities related to equipment leases |  | — |  |  | — |  |  | (209 | )
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | 457 |  |  | (6,357 | ) |  | (872 | )
|  | $ | 39,674 |  |  | $ | (7,485 | ) |  | $ | 25,499 |

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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- Definition Tabular disclosure of all or some of the information related to other significant noncash investing and financing activities that occurred during the accounting period and are not otherwise listed in the existing taxonomy. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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