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Commitments and contingencies - Narrative (Details) - Mountain View Fire
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
May 06, 2024
lawsuit
Nov. 17, 2020
lawsuit
Commitments Disclosure [Line Items]      
Number of active lawsuits     22
Number of lawsuits filed by groups of plaintiffs     15
Number of wrongful death lawsuits     1
Number of non-litigation claims     6
Number of lawsuits filed by insurance companies   20  
Accrued estimated losses | $ $ 172,300    
Expected recoveries of insurance amount | $ 116,000    
Expenses of wildlife memerandum account | $ $ 56,300    
Damage from Fire, Explosion or Other Hazard      
Commitments Disclosure [Line Items]      
Number of non-litigation claims     1
Trial on the remaining lawsuits     2