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Accounts Payable and Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Trade and other current payables [abstract]  
Schedule of accounts payable and accrued liabilities
Accounts payable and accrued liabilities consist of: 
 
 
December 31,
2018

 
December 31,
2017

Trade accounts payable(1)
 
$
52,201

 
$
47,138

Royalties payable
 
2,004

 
4,896

Other accounts payable and trade related accruals
 
32,896

 
29,690

Payroll and related benefits
 
26,817

 
29,329

Severance accruals
 
1,791

 
1,092

Other taxes payable
 
4,044

 
3,439

Other
 
11,990

 
24,114

 
 
$
131,743

 
$
139,698

(1)
No interest is charged on the trade accounts payable ranging from 30 to 60 days from the invoice date. The Company has policies in place to ensure that all payables are paid within the credit terms.