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Other Comprehensive Income (Loss) - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of service cost | $ 934 | $ 1,653 | $ (3,565) | $ 1,717
Reclassification adjustments | 10,958 | 11,064 | 33,098 | 33,920
Income before income taxes | (133,241) | (113,787) | (400,114) | (331,671)
Provision for income taxes | 26,889 | 30,019 | 87,678 | 88,160
Net income | (106,352) | (83,768) | (312,436) | (243,511)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification adjustments | 1,610 | 1,681 | 4,869 | 5,004
Income before income taxes | 1,610 | 1,681 | 4,869 | 5,004
Provision for income taxes | (366) | (627) | (1,105) | (1,845)
Net income | 1,244 | 1,054 | 3,764 | 3,159
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of service cost | 1,725 | 2,075 | 5,396 | 5,625
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | 1,725 | 2,075 | 5,396 | 5,625
Provision for income taxes | (455) | (607) | (1,417) | (1,753)
Net income | $ 1,270 | $ 1,468 | $ 3,979 | $ 3,872

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