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1. Basis of Presentation and Use of Estimates Organization, Consolidation and Presentation of Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 553,979	$ 551,519
Cost of goods sold	242,217	249,316
Deferred Revenue	41,100		$ 37,300
Deferred Revenue, Period Increase (Decrease)	15,200
Revenue, Net	11,400
Retained earnings	4,585,701		3,722,073
Accumulated other comprehensive income	(80,965)		(46,958)
Total Stockholders' Equity	$ 4,863,855	$ 4,488,091	4,020,331		$ 2,930,250
Revenue Allocation Percent To Lease Elements	3.00%	5.00%
Additional paid-in-capital	$ 402,847		$ 394,342
Unrealized Gain on Securities	1,059,230	$ 815,934
Selling, general and administrative expense	207,581	209,130
Research and Development Expense	47,575	49,427
Interest expense	5,986	5,782
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				$ 100
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized Cloud Computing Arrangements	700
Europe [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	185,900	199,600
Asia Pacific [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	106,400	109,400
UNITED STATES
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	226,100	209,900
Americas [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 35,600	$ 32,600

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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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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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