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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 20,311 $ 521,503 $ 469,053
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation expense 39,436 40,998 33,368
Deferred income taxes 45,510 1,204 6,581
Depreciation 61,450 51,684 45,287
Amortization of intangibles 44,552 44,765 44,700
Excess tax benefit related to stock option plans   13,844 12,955
Gain on sale of assets   (1,500) (1,377)
In-process research and development and other non-cash charges 5,000   4,638
Change in operating assets and liabilities, net of acquisitions:      
Increase in accounts receivable (24,013) (31,721) (49,888)
Decrease (increase) in inventories 731 (20,147) (19,967)
Increase in other current assets (16,323) (2,436) (17,206)
Increase in other assets (24,098) (1,076) (9,634)
Increase in accounts payable and other current liabilities 3,175 6,842 27,451
Increase in deferred revenue and customer advances 10,386 9,974 16,172
Effect of the 2017 Tax Act 530,383    
Increase in other liabilities 1,140 8,986 11,115
Net cash provided by operating activities 697,640 642,920 573,248
Cash flows from investing activities:      
Additions to property, plant, equipment and software capitalization (85,473) (94,967) (100,012)
Business acquisitions, net of cash acquired   (5,609) (23,494)
Investment in unaffiliated company (7,000)    
Payments for intellectual property licenses (5,000)   (3,000)
Purchases of investments (2,960,379) (2,396,032) (2,010,368)
Maturities and sales of investments 2,522,100 2,004,690 1,731,981
Proceeds from sale of assets   4,000 5,154
Net cash used in investing activities (535,752) (487,918) (399,739)
Cash flows from financing activities:      
Proceeds from debt issuances 1,480,190 485,298 325,219
Payments on debt (1,310,214) (325,323) (120,140)
Payments of debt issuance costs (2,984) (1,705) (2,382)
Proceeds from stock plans 97,789 62,189 52,060
Purchases of treasury shares (332,544) (325,759) (334,705)
Proceeds from (payments for) derivative contracts 3,894 (10,401) (2,601)
Net cash used in financing activities (63,869) (115,701) (82,549)
Effect of exchange rate changes on cash and cash equivalents 38,669 (21,335) (25,472)
Increase in cash and cash equivalents 136,688 17,966 65,488
Cash and cash equivalents at beginning of period 505,631 487,665 422,177
Cash and cash equivalents at end of period 642,319 505,631 487,665
Supplemental cash flow information:      
Income taxes paid 70,583 50,007 51,750
Interest paid $ 56,503 $ 43,595 $ 37,396