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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 521,571 $ 592,198 $ 593,794
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation 36,865 38,577 37,541
Deferred income taxes (2,693) 9,620 2,405
Depreciation 68,685 53,839 57,952
Amortization of intangibles 56,676 51,457 50,456
Asset Impairments 6,945    
Change in operating assets and liabilities, net of acquisitions:      
Decrease (increase) in accounts receivable 37,467 (22,195) (47,921)
Decrease (increase) in inventories 18,940 (31,854) (25,396)
Increase in other current assets (27,030) (10,918) (12,446)
(Increase) decrease in other assets (37,865) (16,470) 6,047
Increase (decrease) in accounts payable and other current liabilities 140,598 9,784 (81,663)
Increase in deferred revenue and customer advances 11,073 12,189 2,721
Effect of the 2017 Tax Cuts and Jobs Act   (3,229) (6,059)
(Decrease) increase in other liabilities (40,725) (39,911) 27,015
Net cash provided by operating activities 790,507 643,087 604,446
Cash flows from investing activities:      
Additions to property, plant, equipment and software capitalization (172,384) (163,823) (96,079)
Asset and business acquisitions, net of cash acquired (80,545)   (31,486)
Investment in unaffiliated company (6,143) (8,843) (7,615)
Purchases of investments (25,884) (36,951) (1,006,080)
Maturities and sales of investments 20,862 978,419 2,824,562
Net cash (used in) provided by investing activities (264,094) 768,802 1,683,302
Cash flows from financing activities:      
Proceeds from debt issuances 315,000 925,670 274
Payments on debt (640,366) (390,482) (850,435)
Payments of debt issuance costs   (2,932)  
Proceeds from stock plans 66,033 53,715 52,429
Purchases of treasury shares (196,409) (2,469,258) (1,315,106)
Proceeds from (payments for) derivative contracts 15,240 10,609 (6,684)
Net cash used in financing activities (440,502) (1,872,678) (2,119,522)
Effect of exchange rate changes on cash and cash equivalents 15,069 224 (14,265)
Increase (decrease) in cash and cash equivalents 100,980 (460,565) 153,961
Cash and cash equivalents at beginning of period 335,715 796,280 642,319
Cash and cash equivalents at end of period 436,695 335,715 796,280
Supplemental cash flow information:      
Income taxes paid 97,621 87,998 159,397
Interest paid $ 52,103 $ 42,843 $ 50,798