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Components of Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss | During 2019, changes in amounts included in our accumulated other comprehensive loss (AOCL) by component on our Condensed Consolidated Balance Sheets, net of tax, are:
|  |  |  |  |  | Pension Plans |  |  | OPEB |  |  |  |  |
(in thousands) |  | Gains and losses on cash flow hedges |  |  | Actuarial Loss |  |  | Prior Service Cost |  |  | Actuarial Loss |  |  | Prior Service Credit |  |  | Total |
Balance at December 31, 2018 |  | $ | 1,560 |  |  | $ | 128,849 |  |  | $ | 404 |  |  | $ | 7,269 |  |  | $ | (8,651 | ) |  | $ | 129,431 |
Amounts arising during the period |  |  | 19,192 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19,192 |
Amounts reclassified from AOCL to earnings |  |  | (262 | ) |  |  | (4,994 | ) |  |  | (78 | ) |  |  | (374 | ) |  |  | 3,272 |  |  |  | (2,436 | )
Net change |  |  | 18,930 |  |  |  | (4,994 | ) |  |  | (78 | ) |  |  | (374 | ) |  |  | 3,272 |  |  |  | 16,756 |
Balance at June 30, 2019 |  | $ | 20,490 |  |  | $ | 123,855 |  |  | $ | 326 |  |  | $ | 6,895 |  |  | $ | (5,379 | ) |  | $ | 146,187 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=114867106&loc=SL7669686-108580 + Details
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