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Income taxes
 6 Months Ended
Jun. 30, 2023
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
For the three and six months ended June 30, 2023, the income tax recovery in the unaudited interim consolidated statements of operations represents an effective tax rate different than the Canadian enacted statutory rate of 26.5%. The differences are as follows:
Three months ended June 30Six months ended June 30
2023202220232022
Expected income tax recovery at Canadian statutory rate$(84,596)$(22,562)$(11,903)$(6,119)
Increase (decrease) resulting from:
Effect of differences in tax rates on transactions in and within foreign jurisdictions and change in tax rates(5,560)(6,562)(16,718)(19,039)
Adjustments from investments carried at fair value40,357 17,216 11,092 18,229 
Change in valuation allowance676 (1,582)(791)(1,731)
Non-controlling interests share of income2,201 4,587 12,393 15,640 
Acquisition-related state deferred tax adjustments— — — 7,600 
Tax credits(8,095)(11,992)(20,505)(22,023)
Amortization and settlement of excess deferred income tax(2,456)(2,296)(6,207)(6,329)
Other1,515 372 1,382 405 
Income tax recovery$(55,958)$(22,819)$(31,257)$(13,367)
The following table illustrates the movement in the deferred tax valuation allowance: 
Three months ended June 30Six months ended June 30
2023202220232022
Beginning balance $97,396 $28,959 $107,583 $27,470 
Charged to income tax recovery676 (1,582)(791)(1,731)
Charged (reduction) to OCI(6,418)2,664 (15,138)4,302 
Reductions to other accounts— (211)— (211)
Ending balance $91,654 $29,830 $91,654 $29,830