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Other Income (Expense) (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
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of convertible debentures |  |  |  |  |  |  |  |  | $ 960,995 | $ 0 | $ 0
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on disposal of equity affiliate | $ 0 | $ 0 | $ 0 | $ 0 | $ (948) | $ 0 | $ 0 | $ 7,060 | 0 | 6,112 | 0
Foreign exchange gain (loss) |  |  |  |  |  |  |  |  | (1,991) | (4,536) | 292
Interest income |  |  |  |  |  |  |  |  | 11,940 | 6,482 | 4,264
Investment Income |  |  |  |  |  |  |  |  | (1,646) | 0 | 0
Other |  |  |  |  |  |  |  |  | (266) | (208) | 160
Other Income (expense) |  |  |  |  |  |  |  |  | 8,037 | 1,738 | 4,716
Insurance proceeds received |  |  |  |  |  |  |  |  |  |  | 13,406
Insurance proceeds classified as investing activities |  |  |  |  |  |  |  |  |  |  | 4,911
Loss related to Tianjin explosion |  |  |  |  |  |  |  |  | 0 | 0 | $ (8,809)
Equity affiliate [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of AOCI, net of tax |  |  |  |  |  |  |  |  |  | $ 1,110 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative principal amount of debt instruments repurchased |  |  |  |  |  |  |  |  | 273,690 |  |
Principal amount of repurchased debt | 53,690 |  | 220,000 |  |  |  |  |  | 53,690 |  |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative principal amount of debt instruments repurchased |  |  |  |  |  |  |  |  | 116,922 |  |
Principal amount of repurchased debt | 116,922 |  |  |  |  |  |  |  | 116,922 |  |
Convertible Senior Debentures, Due 2042 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative principal amount of debt instruments repurchased |  |  |  |  |  |  |  |  | 147,832 |  |
Principal amount of repurchased debt | $ 78,772 |  | $ 69,060 |  |  |  |  |  | $ 78,772 |  |

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