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Other information | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract] |
Other information | Other information a) Supplemental cash flow information
Year ended December 31, |  | 2014 |  |  | 2013 |
Cash paid during the year for: |  |  |  |
Interest |  | $ | 10,939 |  |  | $ | 25,528 |
Income taxes |  | — |  |  | 91 |
Cash received during the year for: |  |  |  |
Interest |  | 63 |  |  | 256 |
Income taxes |  | 88 |  |  | 3,797 |
Year ended December 31, |  | 2014 |  |  | 2013 |
Non-cash transactions: |  |  |  |
Addition of plant and equipment by means of capital leases |  | $ | 39,492 |  |  | $ | 13,812 |
Reclass from plant and equipment to assets held for sale |  | (1,321 | ) |  | (5,123 | )
Net increase in accounts payable related to purchase of plant and equipment |  | 283 |  |  | 2,888 |
Net increase in accounts payable related to purchase of intangibles |  | — |  |  | 43 |
Net decrease in accounts payable related to change in estimated financing fees |  | (101 | ) |  | — |
Net increase in accounts payable related to change in the lease inducement payable on the sublease |  | 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 |
Net (decrease) increase in accrued liabilities related to current portion of RSU liability |  | (924 | ) |  | 1,430 |
Net increase (decrease) in accrued liabilities related to current portion of DSU liability |  | 408 |  |  | (253 | )
Net increase in accrued liabilities related to the current portion of the senior executive stock options |  | 22 |  |  | — |
Net increase in accrued liabilities related to dividend payable |  | 697 |  |  | — |
b) Net change in non-cash working capital
Year ended December 31, |  | 2014 |  |  | 2013 |
Operating activities: |  |  |  |
Accounts receivable, net |  | $ | 3,674 |  |  | $ | 29,765 |
Unbilled revenue |  | (11,454 | ) |  | 30,275 |
Inventories |  | (1,542 | ) |  | (644 | )
Prepaid expenses and deposits |  | (780 | ) |  | 634 |
Accounts payable |  | 9,928 |  |  | (31,847 | )
Accrued liabilities |  | (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 |  | (6,357 | ) |  | (872 | )
|  | $ | (7,485 | ) |  | $ | 25,499 |

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- Definition The entire disclosures of supplemental information, including descriptions and amounts, related to the balance sheet, income statement, and/or cash flow statement. + References No definition available. + Details
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