Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

18.  Property, plant and equipment

As at December 31, 2017		Cost		Accumulated depreciation		Net book value
Land and improvements	$	379,546	$	(68,706)	$	310,840
Buildings		267,334		(103,544)		163,790
Yard and automotive equipment		58,209		(38,126)		20,083
Computer software and equipment		69,718		(60,451)		9,267
Office equipment		25,430		(18,745)		6,685
Leasehold improvements		21,467		(15,090)		6,377
Assets under development		9,539		-		9,539
	$	831,243	$	(304,662)	$	526,581

18.  Property, plant and equipment

As at December 31, 2016		Cost		Accumulated depreciation		Net book value
Land and improvements	$	362,283	$	(60,576)	$	301,707
Buildings		256,168		(91,323)		164,845
Yard and automotive equipment		55,352		(38,560)		16,792
Computer software and equipment		66,265		(57,624)		8,641
Office equipment		22,963		(16,706)		6,257
Leasehold improvements		20,199		(12,541)		7,658
Assets under development		9,130		-		9,130
	$	792,360	$	(277,330)	$	515,030

During the year ended December 31, 2017, interest of $110,000 (2016: $95,000; 2015: $86,000) was capitalized to the cost of assets under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 2.97% (2016: 3.99%; 2015: 6.27%).

Additions during the year include $8,820,000 (2016: $3,376,000; 2015: $943,000) of property, plant and equipment under capital leases.