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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 469,053 $ 431,620 $ 450,003
Adjustments to reconcile net income to net cash provided by operating activities:      
Provisions for doubtful accounts on accounts receivable 1,291 2,037 3,656
Stock-based compensation expense 33,368 32,998 31,708
Deferred income taxes 6,581 1,583 169
Depreciation 45,287 46,393 38,165
Amortization of intangibles 44,700 47,838 41,530
Building impairment   4,718  
Gain on sale of building (1,377)    
In-process research and development and other non-cash charges 4,638 16,481  
Change in operating assets and liabilities, net of acquisitions:      
Increase in accounts receivable (49,888) (29,435) (35,233)
Increase in inventories (19,967) (15,984) (11,389)
(Increase) decrease in other current assets (18,497) (5,784) 5,033
Increase in other assets (9,634) (14,409) (11,467)
Increase (decrease) in accounts payable and other current liabilities 27,451 (13,687) (28,127)
Increase in deferred revenue and customer advances 16,172 9,566 8,512
Increase (decrease) in other liabilities 11,115 (2,287) (7,684)
Net cash provided by operating activities 560,293 511,648 484,876
Cash flows from investing activities:      
Additions to property, plant, equipment and software capitalization (100,012) (91,122) (118,450)
Business acquisitions, net of cash acquired (23,494) (27,008) (41,395)
Payments for intellectual property licenses (3,000) (15,126)  
Purchases of investments (2,010,368) (2,196,153) (2,972,116)
Maturities and sales of investments 1,731,981 1,925,816 2,667,232
Proceeds from sale of building 5,154 1,563  
Net cash used in investing activities (399,739) (402,030) (464,729)
Cash flows from financing activities:      
Proceeds from debt issuances 325,219 381,673 1,032,209
Payments on debt (120,140) (239,776) (886,644)
Payments of debt issuance costs (2,382) (1,400) (2,039)
Proceeds from stock plans 52,060 73,849 68,958
Purchases of treasury shares (334,705) (337,444) (301,580)
Excess tax benefit related to stock option plans 12,955 15,703 15,842
(Payments for) proceeds from derivative contracts (2,601) 174 8,666
Net cash used in financing activities (69,594) (107,221) (64,588)
Effect of exchange rate changes on cash and cash equivalents (25,472) (21,016) 4,202
Increase (decrease) in cash and cash equivalents 65,488 (18,619) (40,239)
Cash and cash equivalents at beginning of period 422,177 440,796 481,035
Cash and cash equivalents at end of period 487,665 422,177 440,796
Supplemental cash flow information:      
Income taxes paid 51,750 60,971 55,928
Interest paid $ 37,396 $ 34,332 $ 29,563