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Segment and Geographic Data, Operating Margin Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (1,559)
Restructuring and severance costs | 0 | 0 | 0 | 0 | (6,079) | (3,244) | (481) | (1,469) | 0 | (11,273) | (19,199)
U.S. pension settlement charges |  |  |  |  |  |  |  |  | 0 | 0 | (79,321)
Segment Operating Income |  |  |  |  |  |  |  |  | 755,888 | 581,740 | 446,310
Consolidated Operating Income | $ 119,667 | $ 138,098 | $ 123,293 | $ 104,062 | 76,006 | 95,416 | 85,005 | 67,578 | 485,120 | 324,005 | 197,058
Unallocated Other Income (Expense) |  |  |  |  | (8,981) | (9,228) | (9,296) | (17,136) | (68,344) | (44,641) | (102,842)
Income before taxes |  |  |  |  | $ 67,025 | $ 86,188 | $ 75,709 | $ 50,442 | 416,776 | 279,364 | 94,216
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | $ (270,768) | $ (246,462) | $ (228,494)

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