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Leases (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Leases [Abstract]  
Summary of changes in ROU Assets
The following table summarizes changes in ROU Assets for the year ended December 31, 2019, which have been recorded in property, plant and equipment on the Consolidated Statements of Financial Position:
 
 
December 31,
2019

Cost
 
 
Balance, January 1, 2019 (1)
 
$
34,983

Additions after January 1, 2019
 
$
33,895

Assets acquired from Tahoe (Note 8)
 
$
8,520

Transfer out
 
$
(16,619
)
Balance, December 31, 2019
 
60,779

 
 
 
Accumulated Depreciation
 
 
Balance at January 1, 2019
 
$
(4,780
)
Amortization
 
$
(17,674
)
Transfer out
 
$
7,465

Balance, December 31, 2019
 
(14,989
)
Carrying Amounts
 
 
At January 1, 2019
 
30,203

At December 31, 2019
 
$
45,790

(1)
Includes $21.4 million in newly recognized ROU assets.
Reconciliation of undiscounted cash flows
The following table presents a reconciliation of the Company's undiscounted cash flows at December 31, 2019 and December 31, 2018 to their present value for the Company's lease obligations:
 
 
December 31,
2019

 
December 31,
2018

Within one year
 
$
16,221

 
$
5,488

Between one and five years
 
23,099

 
1,335

Beyond five years
 
21,675

 
—

Total undiscounted lease obligations
 
60,995

 
6,823

Less: future interest charges
 
(19,787
)
 
(147
)
Total discounted lease obligations
 
$
41,208

 
$
6,676

Less: current portion of lease obligations
 
(14,198
)
 
(5,356
)
Non-current portion of lease obligations
 
$
27,010

 
$
1,320
Reconciliation of lease commitments
The following table reconciles the Company’s lease commitments disclosed in the consolidated financial statements as at and for the year ended December 31, 2019, to the lease obligations recognized on initial application of IFRS 16:
Operating lease commitments at December 31, 2018
 
$
19,260

Discounted using the incremental borrowing rate at January 1, 2019
 
$
(2,819
)
Recognition exemptions for short-term and low-value leases
 
$
(455
)
Variable payments not included in lease liabilities
 
$
(233
)
Lease obligations recognized at January 1, 2019 related to operating lease commitments at December 31, 2018
 
$
15,753