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Property, plant and equipment
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment
December 31, 2018
 
Cost

 
Accumulated
Depreciation

 
Net Book Value

Owned assets
 
 
 
 
 
 
Heavy equipment
 
$
346,071

 
$
78,296

 
$
267,775

Major component parts in use
 
143,032

 
66,019

 
77,013

Other equipment
 
33,824

 
21,711

 
12,113

Licensed motor vehicles
 
19,745

 
15,618

 
4,127

Office and computer equipment
 
8,972

 
6,450

 
2,522

Land
 
11,095

 

 
11,095

Buildings
 
31,425

 
6,265

 
25,160

Leasehold improvements
 
2,875

 
1,053

 
1,822

 
 
597,039

 
195,412

 
401,627

 
 
 
 
 
 
 
Assets under capital lease
 
 
 
 
 
 
Heavy equipment
 
110,759

 
35,376

 
75,383

Major component parts in use
 
64,602

 
16,964

 
47,638

Other equipment
 
772

 
17

 
755

Licensed motor vehicles
 
3,822

 
1,087

 
2,735

Office and computer equipment
 
23

 
23

 

Buildings
 
25

 
6

 
19


 
180,003

 
53,473

 
126,530

 
 
 
 
 
 
 
Total property, plant and equipment
 
$
777,042

 
$
248,885

 
$
528,157

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


During the year ended December 31, 2018, additions to property, plant and equipment by means of capital leases were $21,904 (2017 - $14,033). During the year ended December 31, 2018, the Company completed sale-leaseback transactions of $29,295 (2017 - $20,697). Deferred gains on sale-leaseback transactions are included in other long term obligations and are amortized over the expected life of the equipment (note 17(d)). Depreciation of equipment under capital lease of $25,995 (2017$19,483) was included in depreciation expense in the current year.