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Related party transactions (Tables)
12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]  
Schedule of related party transactions
The following table provides the balance sheet balances with the NL Partnership and its affiliates:
 
 
December 31, 2019

 
December 31, 2018

Accounts receivable
 
$
1,202

 
$
3,074

Accounts payable and accrued liabilities
 
251

 
13

The following table provides the total dollar amount for income statement transactions that have been entered into with the NL Partnership and its affiliates during the year ended:
 
 
December 31, 2019

 
December 31, 2018

Revenue
 
$
597

 
$
677

Management fee revenue
 
2,482

 
345