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Accumulated other comprehensive income (loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
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) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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