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Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Apr. 01, 2017
Changes In Components Of OCI [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other |  | $ 44,969 | $ 36,833
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | 0 | 1,728
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  | 228 | 97
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (282) | (406)
Net change in accumulated other comprehensive income (loss) |  | 23,378 | 38,477
Other comprehensive income before reclassifications [Member] |  |  |
Changes In Components Of OCI [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other | [1] | 46,400 | 37,581
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | 0 | 1,728
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 0 | 5
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member] |  |  |
Changes In Components Of OCI [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other |  | 11,924 | 7,290
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Changes In Components Of OCI [Line Items] |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other |  | (1,178) | (1,335)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | 0 | 0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  | 228 | 97
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 282 | 401
Cumulative impact of newly adopted accounting standard updates [Member] |  |  |
Changes In Components Of OCI [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | [2] | $ (22,354) | $ 0
[1] | Includes intra-entity foreign currency transactions that are of a long-term investment nature of $11,924 and $7,290 for the first quarter of 2018 and 2017, respectively.
[2] | Amounts relate to unrealized gains and losses on investments and stranded tax effects reclassified from accumulated other comprehensive income to retained earnings in accordance with ASU No. 2018-02 and ASU No. 2016-01 (Note B).

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