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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 (loss) $ 451,779 $ 257,692 $ (43,421)
Adjustments to reconcile net income (loss) from operations to net cash provided by operating activities:      
Depreciation 67,415 66,122 64,782
Amortization 45,809 41,953 55,227
Stock-based compensation 33,577 34,097 30,750
Deferred taxes 28,340 37,105 (62,936)
Provision for excess and obsolete inventory 11,242 8,844 17,493
Contingent consideration fair value adjustment 987 7,820 15,896
Losses (gains) on investments 3,494 (878) (1,050)
Retirement plans actuarial gains (3,316) (6,624) (3,203)
Property insurance recovery, net   (4,309)  
Goodwill impairment   254,946
Acquired intangible assets impairment 8,800   83,339
Tax benefit related to employee stock compensation awards     (6,198)
Other 1,083 1,585 602
Changes in operating assets and liabilities, net of businesses acquired:      
Accounts receivable (17,938) (80,584) 18,325
Inventories (29,498) 44,960 34,263
Prepayments and other assets (58,402) 2,254 (19,194)
Accounts payable and other accrued expenses 13,693 43,574 6,820
Deferred revenue and customer advances 13,379 4,984 (3,634)
Retirement plan contributions (4,334) (5,902) (6,044)
Income taxes (80,429) 173,802 18,434
Net cash provided by operating activities 476,881 626,495 455,197
Cash flows from investing activities:      
Purchases of property, plant and equipment (114,379) (105,375) (85,272)
Proceeds from government subsidy for property, plant and equipment 7,920    
Purchases of marketable securities (918,744) (1,391,917) (1,656,267)
Proceeds from maturities of marketable securities 1,270,439 701,681 243,232
Proceeds from sales of marketable securities 846,122 527,746 852,794
Proceeds from insurance 1,126 5,064 5,051
Acquisition of businesses, net of cash acquired (169,474)    
Net cash provided by (used for) investing activities 923,010 (262,801) (640,462)
Cash flows from financing activities:      
Issuance of common stock under stock purchase and stock option plans 20,973 24,493 20,473
Repurchase of common stock (823,478) (200,304) (146,331)
Dividend payments (67,322) (55,447) (48,619)
Payments related to net settlement of employee stock compensation awards (20,023) (12,881) (9,398)
Payments of contingent consideration (13,571) (1,050) (11,697)
Proceeds from issuance of convertible notes, net of issuance costs     450,800
Purchase of convertible note hedges     (100,834)
Proceeds from issuance of warrants     67,852
Tax benefit related to employee stock compensation awards     6,198
Net cash (used for) provided by financing activities (903,421) (245,189) 228,444
Effects of exchange rate changes on cash and cash equivalents 439 3,454  
Increase in cash and cash equivalents 496,909 121,959 43,179
Cash and cash equivalents at beginning of year 429,843 307,884 264,705
Cash and cash equivalents at end of year 926,752 429,843 307,884
Cash paid for:      
Interest 6,205 6,446 446
Income taxes $ 72,811 $ 53,775 $ 40,424