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Other information (Tables)
 12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]  
Schedule of supplemental cash flow information
Supplemental cash flow information
Year ended December 31,
 
2013

 
2012

Cash paid during the year for:
 
 
 
 
Interest
 
$
25,528

 
$
29,625

Income taxes
 
91

 
5,072

Cash received during the year for:
 
 
 
 
Interest
 
256

 
8

Income taxes
 
3,797

 
97

Year ended December 31,
 
2013

 
2012

Non-cash transactions:
 
 
 
 
Acquisition of property, plant and equipment for continuing operations by means of capital leases
 
$
13,812

 
$
47,297

Additions to assets held for sale
 
(5,123
)
 
(10,444
)
Net change in accounts payable related to purchase of property, plant and equipment
 
2,931

 
(2,198
)
Net change in current portion of equipment lease liabilities included in accrued liabilities related to the purchase of property, plant and equipment
 
(159
)
 
(1,574
)
Net change in long term portion of equipment lease liabilities related to the purchase of property, plant and equipment
 
1,702

 
(1,702
)
Net change in property, plant and equipment resulting from reclassification to inventory
 
—

 
2,219

Net change in accrued liabilities related to current portion of RSU liability
 
1,430

 
(1,639
)
Net change in accrued liabilities related to current portion of DDSU liability
 
(253
)
 
253
Schedule of net change in non-cash working capital
Net change in non-cash working capital
Year ended December 31,
 
2013

 
2012

Operating activities:
 
 
 
 
Accounts receivable, net
 
$
29,765

 
$
70,577

Unbilled revenue
 
30,275

 
56,625

Inventories
 
(644
)
 
3,416

Prepaid expenses and deposits
 
634

 
5,050

Accounts payable
 
(31,847
)
 
(35,292
)
Accrued liabilities
 
(1,603
)
 
(11,534
)
Long term portion of liabilities related to equipment leases
 
(209
)
 
(1,721
)
Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(872
)
 
(2,160
)
 
 
$
25,499

 
$
84,961