Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, plant and equipment

Schedule of Property, Plant and Equipment

			Accumulated
As at December 31, 2020	Cost		depreciation		Net book value
Land and improvements	$	370,511	$	(81,591)	$	288,920
Buildings		259,928		(125,944)		133,984
Yard and automotive equipment		74,151		(47,663)		26,488
Computer software and equipment		86,423		(72,169)		14,254
Office equipment		35,587		(24,729)		10,858
Leasehold improvements		21,654		(15,510)		6,144
Assets under development		11,479		—		11,479
	$	859,733	$	(367,606)	$	492,127

			Accumulated
As at December 31, 2019	Cost		depreciation		Net book value
Land and improvements	$	361,623	$	(77,015)	$	284,608
Buildings		252,774		(115,423)		137,351
Yard and automotive equipment		66,871		(40,686)		26,185
Computer software and equipment		80,756		(68,431)		12,325
Office equipment		31,760		(21,776)		9,984
Leasehold improvements		19,756		(16,541)		3,215
Assets under development		10,814		—		10,814
	$	824,354	$	(339,872)	$	484,482