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SHAREHOLDERS' EQUITY Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Jul. 01, 2018	Dec. 31, 2017	Jul. 02, 2017	Jan. 01, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (12,229)	$ (6,880)	$ (12,229)	$ (6,880)	$ (11,634)	$ (6,804)	$ (8,447)	$ (11,433)
Unrealized gain on investments, net of tax	(595)	1,567	(3,900)	4,553
Change in accounting standard cumulative-effect adjustment			(1,525)	0
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(12,229)	(8,201)	(12,229)	(8,201)	(11,634)	(8,329)	(9,344)	(11,684)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(595)	1,143	(3,900)	3,483
Change in accounting standard cumulative-effect adjustment			0	0
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0	1,321	0	1,321	$ 0	$ 1,525	$ 897	$ 251
Unrealized gain on investments, net of tax	$ 0	$ 424	0	1,070
Change in accounting standard cumulative-effect adjustment			$ (1,525)	$ 0

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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