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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Cash flows from operating activities:    
Net income $ 73,145 $ 144,951
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 27,552 25,578
Amortization 43,925 43,744
Stock-based compensation 18,077 21,396
Provision for excess and obsolete inventory 5,775 10,927
Deferred taxes (15,230) 15,937
Non cash charge for the sale of inventories revalued at the date of acquisition   6,089
Contingent consideration adjustment   (8,373)
Tax benefit related to stock options and restricted stock units (1,584) (7,600)
Retirement plans actuarial (gains) losses (1,359) 3,054
Impairment loss on property, plant and equipment 1,074  
Other 1,077 (471)
Changes in operating assets and liabilities:    
Accounts receivable (74,785) (216,794)
Inventories 26,373 21,446
Prepayments and other assets (17,277) 5,027
Accounts payable and other accrued expenses (15,149) 27,140
Deferred revenue and customer advances (3,090) (6,198)
Retirement plans contributions (2,511) (2,550)
Accrued income taxes 2,964 29,958
Net cash provided by operating activities 68,977 113,261
Cash flows from investing activities:    
Purchases of property, plant and equipment (50,798) (57,804)
Purchases of marketable securities (458,070) (153,871)
Proceeds from maturities of marketable securities 268,546 86,192
Proceeds from sales of marketable securities 50,255 10,028
Net cash used for investing activities (190,067) (115,455)
Cash flows from financing activities:    
Issuance of common stock under employee stock option and stock purchase plans 9,638 16,984
Tax benefit related to stock options and restricted stock units 1,584 7,600
Payments of long-term debt (1,063) (1,246)
Payments of contingent consideration (388) (5,824)
Net cash provided by financing activities 9,771 17,514
(Decrease) increase in cash and cash equivalents (111,319) 15,320
Cash and cash equivalents at beginning of period 338,920 573,736
Cash and cash equivalents at end of period $ 227,601 $ 589,056