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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance - January 1 | $ (579,196) | $ (569,430) |
Other comprehensive income (loss) before reclassifications | (18,408) | (15,775) |
Amounts reclassified from AOCL | 9,417 | 6,009 |
Other comprehensive income (loss) | (8,991) | (9,766) | $ (67,806)
Balance - December 31 | (588,187) | (579,196) | (569,430)
Accumulated net loss from net investment hedge, net of tax | 48,800 | 12,100 |
Net of tax | (9,417) | (6,009) |
Foreign Currency Translation Items |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance - January 1 | (441,364) | (447,925) |
Other comprehensive income (loss) before reclassifications | 388 | 6,561 |
Amounts reclassified from AOCL | 0 | 0 |
Other comprehensive income (loss) | 388 | 6,561 |
Balance - December 31 | (440,976) | (441,364) | (447,925)
Net of tax | 0 | 0 |
Pension and other post-retirement effects |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance - January 1 | (137,161) | (120,647) |
Other comprehensive income (loss) before reclassifications | (18,979) | (22,523) |
Amounts reclassified from AOCL | 9,417 | 6,009 |
Other comprehensive income (loss) | (9,562) | (16,514) |
Balance - December 31 | (146,723) | (137,161) | (120,647)
Amount of settlement of reclassification adjustment from accumulated other comprehensive income (loss) | (836) | (859) |
Tax benefit | 3,148 | 1,887 |
Net of tax | (9,417) | (6,009) |
Cash flow hedging activity |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance - January 1 | (671) | (858) |
Other comprehensive income (loss) before reclassifications | 183 | 187 |
Amounts reclassified from AOCL | 0 | 0 |
Other comprehensive income (loss) | 183 | 187 |
Balance - December 31 | (488) | (671) | (858)
Net of tax | 0 | 0 |
Noncontrolling Interests |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) | 769 | 579 | 668
Foreign currency translation adjustments, attributable to noncontrolling interest | 5,900 | 5,100 | $ 4,500
Amortization of actuarial losses |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Reclassification from AOCI, before tax | (11,161) | (6,608) |
Prior service costs |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Reclassification from AOCI, before tax | $ (568) | $ (429) |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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