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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Loss, Net of Tax | following:
(in thousands) |  | Pension Plans and Other Postretirement Benefits |  | Foreign Currency Translation Adjustments |  |  | Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017 |  | $ | (63,520) |  |  | $ | (82,474) |  |  |  | $ | (145,994) |
Other comprehensive income (loss) before reclassifications |  | (25,027) |  |  | (12,287) |  |  |  | (37,314) |
Amounts reclassified from accumulated other comprehensive loss (a) |  | 1,992 |  |  | 0 |  |  |  | 1,992 |
Other comprehensive income (loss) |  | (23,035) |  |  | (12,287) |  |  |  | (35,322) |
Balance at December 31, 2018 |  | (86,555) |  |  | (94,761) |  |  |  | (181,316) |
Other comprehensive income (loss) before reclassifications |  | 15,983 |  |  | 1,808 |  |  |  | 17,791 |
Amounts reclassified from accumulated other comprehensive loss (a) |  | 777 |  |  | 0 |  |  |  | 777 |
Other comprehensive income (loss) |  | 16,760 |  |  | 1,808 |  |  |  | 18,568 |
Balance at December 31, 2019 |  | (69,795) |  |  | (92,953) |  |  |  | (162,748) |
Other comprehensive income (loss) before reclassifications |  | (25,490) |  |  | 12,560 |  |  |  | (12,930) |
Amounts reclassified from accumulated other comprehensive loss (a) |  | 2,514 |  |  | 0 |  |  |  | 2,514 |
Other comprehensive income (loss) |  | (22,976) |  |  | 12,560 |  |  |  | (10,416) |
Balance at December 31, 2020 |  | $ | (92,771) |  |  | $ | (80,393) |  |  |  | $ | (173,164) |
(a) The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 17 for further information.

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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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