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Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | $ 137,563 | $ 310,803
Other comprehensive income (loss) before reclassifications |  |  | 6,294 | 12,106
Amounts reclassified from accumulated other comprehensive loss |  |  | 10,227 | 8,061
Realized (gains) losses reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment (See Note 4, Equity Method Investments) |  |  |  | 3,037
Other comprehensive income (loss) from equity method investee |  |  |  | 3,764
Total other comprehensive income (loss) | $ (864) | $ 7,321 | 16,521 | 26,968
Less: Other Comprehensive loss attributable to noncontrolling interests |  |  | (1,534) | 418
Other comprehensive income (loss) attributable to Harsco Corporation |  |  | 14,987 | 27,386
Balances | 186,896 | 300,949 | 186,896 | 300,949
Cumulative Foreign Exchange Translation Adjustments |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | (144,534) | (125,561)
Other comprehensive income (loss) before reclassifications |  |  | 26,386 | (9,502)
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | 0
Realized (gains) losses reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment (See Note 4, Equity Method Investments) |  |  |  | 3,079
Other comprehensive income (loss) from equity method investee |  |  |  | 3,650
Total other comprehensive income (loss) |  |  | 26,386 | (2,773)
Less: Other Comprehensive loss attributable to noncontrolling interests |  |  | (1,534) | 425
Other comprehensive income (loss) attributable to Harsco Corporation |  |  | 24,852 | (2,348)
Balances | (119,682) | (127,909) | (119,682) | (127,909)
Effective Portion of Deriviatives Designated as Hedging Instruments |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | (1,089) | (400)
Other comprehensive income (loss) before reclassifications |  |  | (913) | (2,262)
Amounts reclassified from accumulated other comprehensive loss |  |  | 185 | (129)
Realized (gains) losses reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment (See Note 4, Equity Method Investments) |  |  |  | 106
Other comprehensive income (loss) from equity method investee |  |  |  | (266)
Total other comprehensive income (loss) |  |  | (728) | (2,551)
Less: Other Comprehensive loss attributable to noncontrolling interests |  |  | 0 | (7)
Other comprehensive income (loss) attributable to Harsco Corporation |  |  | (728) | (2,558)
Balances | (1,817) | (2,958) | (1,817) | (2,958)
Cumulative Unrecognized Actuarial Losses on Pension Obligations |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | (461,094) | (389,696)
Other comprehensive income (loss) before reclassifications |  |  | (19,185) | 23,873
Amounts reclassified from accumulated other comprehensive loss |  |  | 10,042 | 8,190
Realized (gains) losses reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment (See Note 4, Equity Method Investments) |  |  |  | (148)
Other comprehensive income (loss) from equity method investee |  |  |  | 380
Total other comprehensive income (loss) |  |  | (9,143) | 32,295
Less: Other Comprehensive loss attributable to noncontrolling interests |  |  | 0 | 0
Other comprehensive income (loss) attributable to Harsco Corporation |  |  | (9,143) | 32,295
Balances | (470,237) | (357,401) | (470,237) | (357,401)
Unrealized Loss on Marketable Securities |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | (5) | (31)
Other comprehensive income (loss) before reclassifications |  |  | 6 | (3)
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | 0
Realized (gains) losses reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment (See Note 4, Equity Method Investments) |  |  |  | 0
Other comprehensive income (loss) from equity method investee |  |  |  | 0
Total other comprehensive income (loss) |  |  | 6 | (3)
Less: Other Comprehensive loss attributable to noncontrolling interests |  |  | 0 | 0
Other comprehensive income (loss) attributable to Harsco Corporation |  |  | 6 | (3)
Balances | 1 | (34) | 1 | (34)
Accumulated Other Comprehensive Loss |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balances |  |  | (606,722) | (515,688)
Total other comprehensive income (loss) |  |  | 14,987 | 27,386
Balances | $ (591,735) | $ (488,302) | $ (591,735) | $ (488,302)

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