Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, plant and equipment

Property, Plant and Equipment

16.   Property, plant and equipment

			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

			Accumulated
As at December 31, 2018	Cost		depreciation		Net book value
Land and improvements	$	362,781	$	(72,547)	$	290,234
Buildings		252,182		(106,959)		145,223
Yard and automotive equipment		57,983		(36,640)		21,343
Computer software and equipment		70,623		(60,258)		10,365
Office equipment		28,490		(19,582)		8,908
Leasehold improvements		19,735		(16,240)		3,495
Assets under development		7,031		—		7,031
	$	798,825	$	(312,226)	$	486,599

During the year ended December 31, 2019, interest of $85,000 (2018: $110,000; 2017: $110,000) was capitalized to the cost of assets under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 4.07% (2018: 4.06%; 2017: 2.97%).

Additions during the year include $15,282,000 (2018: $8,968,000; 2017: $8,820,000) of property, plant and equipment under capital leases.