Property, plant and equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]



December 31, 2017	Cost		Accumulated Depreciation		Net Book Value
Owned assets
Heavy equipment	$	196,045	$	77,726	$	118,319
Major component parts in use	72,448		45,694		26,754
Other equipment	31,923		18,400		13,523
Licensed motor vehicles	18,298		14,888		3,410
Office and computer equipment	10,157		9,468		689
Land	7,168		—		7,168
Buildings	2,547		2,482		65
	338,586		168,658		169,928

Assets under capital lease
Heavy equipment	69,657		28,613		41,044
Major component parts in use	85,015		21,247		63,768
Other equipment	558		543		15
Licensed motor vehicles	5,129		1,242		3,887
Office and computer equipment	23		17		6
	160,382		51,662		108,720

Total property, plant and equipment	$	498,968	$	220,320	$	278,648



December 31, 2016	Cost		Accumulated Depreciation		Net Book Value
Owned assets
Heavy equipment	$	188,785	$	68,487	$	120,298
Major component parts in use	64,229		49,673		14,556
Other equipment	31,670		16,335		15,335
Licensed motor vehicles	20,353		18,258		2,095
Office and computer equipment	9,769		9,112		657
Buildings	2,523		2,487		36
	317,329		164,352		152,977

Assets under capital lease
Heavy equipment	84,527		21,848		62,679
Major component parts in use	50,882		17,233		33,649
Other equipment	5,178		611		4,567
Licensed motor vehicles	3,373		805		2,568
Office and computer equipment	23		11		12
	143,983		40,508		103,475

Total property, plant and equipment	$	461,312	$	204,860	$	256,452

During the year ended December 31, 2017, additions to property, plant and equipment included $34,730 of assets that were acquired by means of capital leases (2016 – $23,490). Included in capital lease additions during the year ended December 31, 2017 was $20,697 related to sale-leaseback transactions (2016 - $12,674). Deferred gains on these transactions are included in other long term obligations and accrued liabilities and are amortized over the expected life of the equipment (note 16(d)). Depreciation of equipment under capital lease of $19,483 (2016 – $18,536) was included in depreciation expense in the current year.