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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Cash flows from operating activities:    
Net income (loss) $ 363,616 $ (109,767)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 49,243 48,437
Amortization 32,313 46,275
Stock-based compensation 25,620 23,012
Provision for excess and obsolete inventory 7,154 15,148
Contingent consideration fair value adjustment 1,847 10,451
Deferred taxes (679) (42,568)
Retirement plans actuarial gains (2,504) (1,200)
Gain on insurance recovery (4,309)  
Tax benefit related to employee stock compensation awards   (3,399)
Goodwill impairment   254,946
Acquired intangible assets impairment   83,339
Other 429 151
Changes in operating assets and liabilities:    
Accounts receivable (75,623) 45,660
Inventories 23,770 48,601
Prepayments and other assets 7,362 (13,273)
Accounts payable and other accrued expenses 5,298 (39,584)
Deferred revenue and customer advances 34,535 53,380
Retirement plans contributions (4,858) (5,871)
Income taxes 15,808 4,227
Net cash provided by operating activities 479,022 417,965
Cash flows from investing activities:    
Purchases of property, plant and equipment (73,247) (66,252)
Purchases of available-for-sale marketable securities (1,036,523) (875,837)
Proceeds from sales of available-for-sale marketable securities 443,169 466,744
Proceeds from maturities of available-for-sale marketable securities 473,255 202,162
Proceeds from property insurance 5,064 5,051
Net cash used for investing activities (188,282) (268,132)
Cash flows from financing activities:    
Issuance of common stock under stock purchase and stock option plans 24,462 20,085
Repurchase of common stock (151,821) (85,092)
Dividend payments (41,730) (36,548)
Payments related to net settlement of employee stock compensation awards (12,584) (9,229)
Payments of contingent consideration (1,050) (11,697)
Tax benefit related to employee stock compensation awards   3,399
Net cash used for financing activities (182,723) (119,082)
Effects of exchange rate changes on cash and cash equivalents 2,776 2,481
Increase in cash and cash equivalents 110,793 33,232
Cash and cash equivalents at beginning of period 307,884 264,705
Cash and cash equivalents at end of period $ 418,677 $ 297,937