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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification adjustments | $ 11,064 | $ 11,913 | $ 33,920 | $ 33,607
Total before tax | (113,787) | (99,308) | (331,671) | (295,765)
Provision for income taxes | 30,019 | 29,435 | 88,160 | 82,003
Total net of tax | (83,768) | (69,873) | (243,511) | (213,762)
Pension and other postretirement plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | (2,075) | (915) | (5,625) | (2,820)
Provision for income taxes | 607 | 321 | 1,753 | 964
Total net of tax | 1,468 | 594 | 3,872 | 1,856
Amortization of service cost |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 2,075 | 915 | 5,625 | 2,820
Reclassification out of Accumulated Other Comprehensive Income | Reclassification adjustments for derivatives |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification adjustments | 1,681 | 1,701 | 5,004 | 5,144
Total before tax | 1,681 | 1,701 | 5,004 | 5,144
Provision for income taxes | (627) | (619) | (1,845) | (1,872)
Total net of tax | $ 1,054 | $ 1,082 | $ 3,159 | $ 3,272

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