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Financial instruments by category (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of detailed information about financial instruments [abstract]  
Summary of Carrying Value and Fair Value of Financial Instruments
The following table provides the carrying value and the fair value of financial instruments at December 31, 2018 and December 31, 2017:
 
December 31, 2018
 
December 31, 2017
 
Carrying amount

Fair value

 
Carrying amount

Fair value

Financial Assets
 
 
 
 
 
Fair value through OCI
 
 
 
 
 
  Marketable securities
$
2,572

$
2,572

 
$
5,010

$
5,010

Amortized cost
 
 
 
 
 
  Cash and cash equivalents
286,312

286,312

 
479,501

479,501

  Term deposit
6,646

6,646

 
5,508

5,508

  Restricted cash
13,745

13,745

 
12,927

12,927

  Accounts receivable and other
46,196

46,196

 
33,627

33,627

  Other assets
3,924

3,924

 
4,900

4,900

Financial Liabilities at amortized cost
 
 
 
 
 
  Accounts payable and accrued liabilities
140,878

140,878

 
110,541

110,541

  Debt
$
595,977

$
549,606

 
$
593,783

$
595,698