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Non-cash operating items
 6 Months Ended
Jun. 30, 2021
Disclosure Changes In Non Cash Operating Items [Abstract]  
Non-cash operating items Non-cash operating items
The changes in non-cash operating items consist of the following:
Three months ended June 30Six months ended June 30
2021202020212020
Accounts receivable$63,721 $50,264 $33,975 $56,946 
Fuel and natural gas in storage(12,043)(7,951)5,929 3,059 
Supplies and consumables inventory(1,283)(13,164)(4,386)(20,958)
Income taxes recoverable(1,002)(1,270)(1,167)(1,889)
Prepaid expenses(8,014)3,104 (9,043)(7,344)
Accounts payable(5,002)7,833 (44,332)(63,337)
Accrued liabilities(22,062)(4,472)(91,420)(40,039)
Current income tax liability773 (2,379)5,625 1,716 
Asset retirements and environmental obligations(72)(127)(531)(699)
Net regulatory assets and liabilities(66,845)20,731 (334,996)15,916 
$(51,829)$52,569 $(440,346)$(56,629)