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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Jan. 01, 2019 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | $ 1,772,278 | [1] | $ 1,730,060 |  |
Other comprehensive income/(loss) | 6,048 |  | 29,846 |  |
Amounts reclassified from retained earnings to accumulated other comprehensive loss |  |  |  | $ (6,771) | $ 1,721
Ending Balance | 1,801,139 |  | 1,796,456 |  |
Foreign Currency Items |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (251,102) |  | (198,495) |  |
Other comprehensive income/(loss) before reclassifications | (2,852) |  | 22,553 |  |
Other comprehensive income/(loss) | (2,852) |  | 22,553 |  |
Ending Balance | (253,954) |  | (175,942) |  |
Defined Benefit Pension Items |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (487,380) |  | (467,136) |  |
Other comprehensive income/(loss) before reclassifications | (508) |  | (1,145) |  |
Other comprehensive income/(loss) | 7,156 |  | 5,817 |  |
Ending Balance | (480,224) |  | (461,319) |  |
Defined Benefit Pension Items | Net Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | 7,664 |  | 6,962 |  |
Gains and Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (2,431) |  | (641) |  |
Other comprehensive income/(loss) before reclassifications | 2,256 |  | 1,182 |  |
Other comprehensive income/(loss) | 1,864 |  | 1,047 |  |
Amounts reclassified from retained earnings to accumulated other comprehensive loss |  |  |  |  | (176)
Ending Balance | (567) |  | 230 |  |
Gains and Losses on Cash Flow Hedges | Fixed Assets |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | (45) |  | (45) |  |
Gains and Losses on Cash Flow Hedges | Net Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | (347) |  | (180) |  |
Accumulated Other Comprehensive Loss |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (740,913) |  | (666,272) |  |
Other comprehensive income/(loss) before reclassifications | (1,104) |  | 22,590 |  |
Other comprehensive income/(loss) | 6,168 |  | 29,417 |  |
Amounts reclassified from retained earnings to accumulated other comprehensive loss |  |  |  |  | $ (176)
Ending Balance | (734,745) |  | (637,031) |  |
Accumulated Other Comprehensive Loss | Fixed Assets |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | (45) |  | (45) |  |
Accumulated Other Comprehensive Loss | Net Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | $ 7,317 |  | $ 6,782 |  |
[1] | The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.

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