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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 593,794 $ 20,311 $ 521,503
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation 37,541 39,436 40,998
Deferred income taxes 2,405 45,510 1,204
Depreciation 57,952 61,450 51,684
Amortization of intangibles 50,456 44,552 44,765
Excess tax benefit related to stock option plans     13,844
Gain on sale of assets     (1,500)
In-process research and development and other non-cash charges   5,000  
Change in operating assets and liabilities, net of acquisitions:      
Increase in accounts receivable (47,921) (24,013) (31,721)
(Increase) decrease in inventories (25,396) 731 (20,147)
Increase in other current assets (12,446) (16,323) (2,436)
Decrease (increase) in other assets 6,047 (24,098) (1,076)
(Decrease) increase in accounts payable and other current liabilities (81,663) 3,175 6,842
Increase in deferred revenue and customer advances 2,721 10,386 9,974
Enactment of the 2017 Tax Act (6,059) 530,383  
Increase in other liabilities (27,015) 1,140 8,986
Net cash provided by operating activities 604,446 697,640 642,920
Cash flows from investing activities:      
Additions to property, plant, equipment and software capitalization (96,079) (85,473) (94,967)
Asset and business acquisitions, net of cash acquired (31,486)   (5,609)
Investment in unaffiliated companies (7,615) (7,000)  
Payments for intellectual property licenses   (5,000)  
Purchases of investments (1,006,080) (2,960,379) (2,396,032)
Maturities and sales of investments 2,824,562 2,522,100 2,004,690
Proceeds from sale of assets     4,000
Net cash provided by (used in) investing activities 1,683,302 (535,752) (487,918)
Cash flows from financing activities:      
Proceeds from debt issuances 274 1,480,190 485,298
Payments on debt (850,435) (1,310,214) (325,323)
Payments of debt issuance costs   (2,984) (1,705)
Proceeds from stock plans 52,429 97,789 62,189
Purchases of treasury shares (1,315,106) (332,544) (325,759)
(Payments for) proceeds from derivative contracts (6,684) 3,894 (10,401)
Net cash used in financing activities (2,119,522) (63,869) (115,701)
Effect of exchange rate changes on cash and cash equivalents (14,265) 38,669 (21,335)
Increase in cash and cash equivalents 153,961 136,688 17,966
Cash and cash equivalents at beginning of period 642,319 505,631 487,665
Cash and cash equivalents at end of period 796,280 642,319 505,631
Supplemental cash flow information:      
Income taxes paid 159,397 70,583 50,007
Interest paid $ 50,798 $ 56,503 $ 43,595