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Accumulated other comprehensive income (loss) | 12 Months Ended
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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 translation |  | Unrealized gain on cash flow hedges |  |  |  | Pension and post-employment actuarial changes |  | Total
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 operations | 3,528 |  |  | (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 operations | 2,763 |  |  | (10,864) |  |  |  |  | 3,403 |  |  | (4,698) |
Net current period OCI | $ | 28,406 |  |  | $ | (24,282) |  |  |  |  | $ | (17,561) |  |  | $ | (13,437) |
OCI attributable to the non-controlling interests | 691 |  |  | — |  |  |  |  | — |  |  | 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)).

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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