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Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | $ 313,376 | $ 215,165 | $ 137,563 |  |
Adoption of new accounting standard |  |  |  | $ 0 | $ 2,374
Other comprehensive income (loss) before reclassifications | (22,035) | (39,875) |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 21,977 | 18,370 |  |  |
Total other comprehensive income (loss) | (58) | (21,505) | 63,184 |  |
Less: Other comprehensive loss attributable to noncontrolling interests | 972 | 2,500 |  |  |
Other comprehensive income (loss) attributable to Harsco Corporation | 914 | (19,005) |  |  |
Balances | 789,659 | 313,376 | 215,165 |  |
Cumulative Foreign Exchange Translation Adjustments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (159,810) | (111,567) |  |  |
Adoption of new accounting standard |  |  |  | 0 | 0
Other comprehensive income (loss) before reclassifications | 17,261 | (50,743) |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | (1,763) | 0 |  |  |
Total other comprehensive income (loss) | 15,498 | (50,743) |  |  |
Less: Other comprehensive loss attributable to noncontrolling interests | 972 | 2,500 |  |  |
Other comprehensive income (loss) attributable to Harsco Corporation | 16,470 | (48,243) |  |  |
Balances | (143,340) | (159,810) | (111,567) |  |
Effective Portion of Derivatives Designated as Hedging Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | 1,389 | 808 |  |  |
Adoption of new accounting standard |  |  |  | 0 | (1,520)
Other comprehensive income (loss) before reclassifications | (7,050) | 2,466 |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 1,944 | (365) |  |  |
Total other comprehensive income (loss) | (5,106) | 2,101 |  |  |
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 |  |  |
Other comprehensive income (loss) attributable to Harsco Corporation | (5,106) | 2,101 |  |  |
Balances | (3,717) | 1,389 | 808 |  |
Cumulative Unrecognized Actuarial Losses on Pension Obligations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (408,655) | (435,840) |  |  |
Adoption of new accounting standard |  |  |  | (21,429) | 0
Other comprehensive income (loss) before reclassifications | (32,274) | 8,450 |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 21,796 | 18,735 |  |  |
Total other comprehensive income (loss) | (10,478) | 27,185 |  |  |
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 |  |  |
Other comprehensive income (loss) attributable to Harsco Corporation | (10,478) | 27,185 |  |  |
Balances | (440,562) | (408,655) | (435,840) |  |
Unrealized Loss on Marketable Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (31) | 17 |  |  |
Adoption of new accounting standard |  |  |  | 0 | 0
Other comprehensive income (loss) before reclassifications | 28 | (48) |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 |  |  |
Total other comprehensive income (loss) | 28 | (48) |  |  |
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 |  |  |
Other comprehensive income (loss) attributable to Harsco Corporation | 28 | (48) |  |  |
Balances | (3) | (31) | 17 |  |
Total |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (567,107) | (546,582) | (606,722) |  |
Adoption of new accounting standard |  |  |  | $ (21,429) | $ (1,520)
Total other comprehensive income (loss) | 914 | (19,005) | 60,140 |  |
Balances | (587,622) | (567,107) | (546,582) |  |
Accounting Standards Update 2014-09 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (588,536) | (548,102) |  |  |
Balances |  | (588,536) | (548,102) |  |
Accounting Standards Update 2014-09 | Cumulative Foreign Exchange Translation Adjustments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (159,810) | (111,567) |  |  |
Balances |  | (159,810) | (111,567) |  |
Accounting Standards Update 2014-09 | Effective Portion of Derivatives Designated as Hedging Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | 1,389 | (712) |  |  |
Balances |  | 1,389 | (712) |  |
Accounting Standards Update 2014-09 | Cumulative Unrecognized Actuarial Losses on Pension Obligations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | (430,084) | (435,840) |  |  |
Balances |  | (430,084) | (435,840) |  |
Accounting Standards Update 2014-09 | Unrealized Loss on Marketable Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balances | $ (31) | 17 |  |  |
Balances |  | $ (31) | $ 17 |  |

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