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Other information
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]  
Other information
Other information
a) 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


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

 
—


b) 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