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Other information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Schedule of supplemental cash flow information
Year ended December 31,
 
2017

 
2016

Cash paid during the year for:
 
 
 
 
Interest
 
$
5,615

 
$
5,895

Cash received during the year for:
 
 
 
 
Interest
 
162

 
194
Schedule of non-cash transactions
Year ended December 31,
 
2017

 
2016

Non-cash transactions:
 
 
 
 
Addition of property, plant and equipment by means of capital leases
 
34,730

 
23,490

Acquisition of property, plant and equipment related to the initial investment in the partnership
 
2,581

 
—

Increase in capital lease obligations related to the initial investment in the partnership
 
800

 
—

Increase in long term debt related to the initial investment in the partnership
 
637

 
—

Reclass from property, plant and equipment to assets held for sale
 
(6,869
)
 
(1,374
)
Non-cash working capital exclusions:
 
 
 
 
Increase in inventory related to the initial partnership investment
 
(29
)
 
—

Increase in prepaid expenses related to the initial investment in the partnership
 
(4
)
 
—

Decrease in inventory related to a non-monetary transaction
 
—

 
(575
)
Increase in accrued liabilities related to the current portion of the deferred gain on sale-leaseback
 
859

 
365

Net decrease in accrued liabilities related to current portion of RSU liability
 
—

 
(671
)
Net (decrease) increase in accrued liabilities related to dividend payable
 
(59
)
 
569
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,
 
2017

 
2016

Operating activities:
 
 
 
 
Accounts receivable
 
$
(7,148
)
 
$
(15,344
)
Unbilled revenue
 
(5,607
)
 
1,600

Inventories
 
(1,288
)
 
(1,437
)
Prepaid expenses and deposits
 
(283
)
 
126

Accounts payable
 
5,640

 
4,517

Accrued liabilities
 
1,904

 
4,144

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(247
)
 
614

 
 
$
(7,029
)
 
$
(5,780
)