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Other Comprehensive Income (Loss) - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of service cost | $ (131,792) | $ (130,235) | $ (262,265) | $ (250,225)
Reclassification adjustments | (11,304) | (11,205) | (22,856) | (21,694)
Total before tax | (29,613) | (27,886) | (58,141) | (52,568)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of service cost | 1,874 | 912 | 3,550 | 1,905
Total before tax | 1,874 | 912 | 3,550 | 1,905
Total before tax | (594) | (321) | (1,146) | (643)
Total net of tax | 1,280 | 591 | 2,404 | 1,262
Reclassification out of Accumulated Other Comprehensive Income | Derivatives |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 1,646 | 1,719 | 3,323 | 3,443
Reclassification adjustments | 1,646 | 1,719 | 3,323 | 3,443
Total before tax | (583) | (626) | (1,218) | (1,253)
Total net of tax | $ 1,063 | $ 1,093 | $ 2,105 | $ 2,190

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