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Related party transactions (Tables)
12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Schedule of related party transactions The following table provides the balance sheet balances with North American Nuna Joint Venture, NL Partnership and its affiliates:
December 31, 2020December 31, 2019
Accounts receivable$1,179 $1,202 
Other assets1,432 — 
Accounts payable and accrued liabilities5,296 251