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Other information (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Schedule of supplemental cash flow information
Year ended December 31,
 
2016

 
2015

Cash paid during the year for:
 
 
 
 
Interest
 
$
5,895

 
$
9,187

Income taxes
 
—

 
—

Cash received during the year for:
 
 
 
 
Interest
 
194

 
208

Income taxes
 
—

 
—
Schedule of non-cash transactions
Year ended December 31,
 
2016

 
2015

Non-cash transactions:
 
 
 
 
Addition of plant and equipment by means of capital leases
 
$
23,490

 
$
20,058

Reclass from plant and equipment to assets held for sale
 
(1,374
)
 
(1,566
)
Non-cash working capital exclusions:
 
 
 
 
Decrease in inventory resulting from reclassification to plant and equipment
 
—

 
(1,128
)
Decrease in inventory related to a non-monetary transaction
 
(575
)
 
—

Net increase in accounts receivable related to sale of plant and equipment
 
—

 
(3,600
)
Net decrease in accounts payable related to purchase of plant and equipment
 
—

 
(3,197
)
Net decrease in accounts payable related to change in the lease inducement payable on the sublease
 
—

 
(107
)
Increase in accrued liabilities related to the current portion of the deferred gain on sale leaseback
 
365

 
128

Net decrease in accrued liabilities related to current portion of RSU liability
 
(671
)
 
(338
)
Net decrease in accrued liabilities related to current portion of DSU liability
 
—

 
(408
)
Net (decrease) increase in accrued liabilities related to the current portion of the senior executive stock options
 
—

 
(22
)
Net increase (decrease) in accrued liabilities related to dividend payable
 
569

 
(697
)
Schedule of net change in non-cash working capital
The table below represents the cash (used in) provided by non-cash working capital:
Year ended December 31,
 
2016

 
2015

Operating activities:
 
 
 
 
Accounts receivable
 
$
(15,344
)
 
$
45,367

Unbilled revenue
 
1,600

 
26,057

Inventories
 
(1,437
)
 
3,746

Prepaid expenses and deposits
 
126

 
690

Accounts payable
 
4,517

 
(29,751
)
Accrued liabilities
 
4,144

 
(6,892
)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
614

 
457

 
 
$
(5,780
)
 
$
39,674