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Accumulated other comprehensive income (loss)
6 Months Ended
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss)
    AOCI consists of the following balances, net of tax:
Foreign currency cumulative translationUnrealized gain on cash flow hedgesPension and post-employment actuarial changesTotal
Balance, January 1, 2020$(68,822)$75,099 $(16,038)$(9,761)
OCI25,643 (13,418)(20,964)(8,739)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations2,763 (10,864)3,403 (4,698)
Net current period OCI$28,406 $(24,282)$(17,561)$(13,437)
OCI attributable to the non-controlling interests691 — — 691 
Net current period OCI attributable to shareholders of AQN$29,097 $(24,282)$(17,561)$(12,746)
Balance, December 31, 2020$(39,725)$50,817 $(33,599)$(22,507)
OCI(5,910)(63,167) (69,077)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations2,642 39,020 2,165 43,827 
Net current period OCI$(3,268)$(24,147)$2,165 $(25,250)
OCI attributable to the non-controlling interests(8,300)  (8,300)
Net current period OCI attributable to shareholders of AQN$(11,568)$(24,147)$2,165 $(33,550)
Balance, June 30, 2021$(51,293)$26,670 $(31,434)$(56,057)
Amounts reclassified from AOCI for foreign currency cumulative translation affected interest expense and derivative gain (loss); those for unrealized gain (loss) on cash flow hedges affected revenue from non-regulated energy sales, interest expense and derivative gain (loss), while those for pension and other post-employment actuarial changes affected pension and other post-employment non-service costs (note 21(b)(ii)).