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Reclassifications Out of 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 at beginning of period | $ 732,573 |  |
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | 216 | $ 15,261 | $ 774
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 31,765 | 8,623 | (47,470)
Balance at end of period | 809,891 | 732,573 |
MSA Safety Incorporated - Pension and other post-retirement benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (124,848) | (115,517) | (97,948)
Tax benefit | 1,997 | 5,847 | 9,936
Total other comprehensive loss before reclassifications, net of tax | (4,325) | (13,632) | (28,041)
Tax benefit | (4,242) | (2,775) | (3,611)
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | 13,621 | 8,073 | 10,472
Total other comprehensive income (loss) | 0 | (3,772) | 0
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 9,296 | (9,331) | (17,569)
Balance at end of period | (115,552) | (124,848) | (115,517)
MSA Safety Incorporated - Net actuarial (losses) gains |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Unrecognized net actuarial losses/prior service credit (cost) | (6,322) | (19,479) | (37,977)
Amounts reclassified from accumulated other comprehensive loss | 18,079 | 11,028 | 14,507
MSA Safety Incorporated - Prior service (cost) credit |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Amounts reclassified from accumulated other comprehensive loss | (216) | (180) | (424)
MSA Safety Incorporated - Net investment gain (loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 6 | (572) | 0
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | (7) | 578 | (572)
Balance at end of period | (1) | 6 | (572)
MSA Safety Incorporated - Foreign currency translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (89,161) | (102,838) | (73,814)
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | (216) | (15,261) | (774)
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 22,101 | (1,584) | (29,798)
Balance at end of period | (66,844) | (89,161) | (102,838)
Noncontrolling Interests - Pension and other post-retirement benefits |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 0 | 0 | 0
Tax benefit | 0 | 0 | 0
Total other comprehensive loss before reclassifications, net of tax | 0 | 0 | 0
Tax benefit | 0 | 0 | 0
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | 0 | 0 | 0
Total other comprehensive income (loss) | 0 | 0 | 0
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0
Noncontrolling Interests - Net actuarial (losses) gains |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Unrecognized net actuarial losses/prior service credit (cost) | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Noncontrolling Interests - Prior service credit (cost) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Noncontrolling Interests - Net investment gain (loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 0 | 0 | 0
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0
Noncontrolling Interests - Foreign currency translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 423 | 496 | 801
Total amount reclassified from accumulated other comprehensive loss, net of tax, into net income | 0 | 0 | 0
Reclassification to retained earnings due to the adoption of ASU 2018-02 (Note 1) | 159 | (73) | (305)
Balance at end of period | $ 582 | $ 423 | $ 496

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