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Accumulated other comprehensive income (loss)
 12 Months Ended
Dec. 31, 2020
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, 2019$(74,189)$64,333 $(9,529)$(19,385)
Adoption of ASU 2017-12 on hedging— 186 — 186 
Other comprehensive income (loss)4,267 19,177 (7,999)15,445 
Amounts reclassified from AOCI to the consolidated statement of operations3,528 (8,597)1,490 (3,579)
Net current period OCI$7,795 $10,580 $(6,509)$11,866 
OCI attributable to the non-controlling interests(2,428)— — (2,428)
Net current period OCI attributable to shareholders of AQN$5,367 $10,580 $(6,509)$9,438 
Balance, December 31, 2019$(68,822)$75,099 $(16,038)$(9,761)
Other comprehensive income (loss)25,643 (13,418)(20,964)(8,739)
Amounts reclassified from AOCI to the consolidated statement 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)
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 post-employment actuarial changes affected pension and post-employment non-service costs (note 24(b)).