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Intangible assets and goodwill
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets and goodwill Intangible assets and goodwill
Intangible assets consist of the following:
2024CostAccumulated amortizationNet book value
Customer relationships (a)
$74,286 $15,025 $59,261 
Other (b)
10,105 230 9,875 
$84,391 $15,255 $69,136 
2023CostAccumulated amortizationNet book value
Customer relationships$77,059 $14,611 $62,448 
Other (b)
10,203 187 10,016 
$87,262 $14,798 $72,464 
(a) For the year ended 2024, Customer relationships includes foreign exchange of $(2,773) (2023 - $(747)).
(a) Other includes brand names, water rights, easements and miscellaneous intangibles
Estimated amortization expense for intangible assets for each of the next five years is $1,089.
 20242023
Goodwill
Opening balance$1,324,062 $1,320,579 
Business acquisitions— 4,195 
Foreign exchange(11,838)(712)
Closing balance$1,312,224 $1,324,062