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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Cash flows from operating activities:    
Net income $ 6,589 $ 33,564
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation 14,115 12,288
Amortization 21,884 21,815
Stock-based compensation 9,023 10,766
Provision for excess and obsolete inventory 3,800 1,574
Deferred taxes (6,183) 7,699
Non cash charge for the sale of inventories revalued at the date of acquisition   4,871
Contingent consideration adjustment   (1,825)
Other 131 (487)
Changes in operating assets and liabilities:    
Accounts receivable (13,191) (92,217)
Inventories (4,040) 23,636
Prepayments and other assets (1,070) 1,885
Accounts payable and other accrued expenses (47,258) (9,259)
Deferred revenue and customer advances (10,146) (1,704)
Retirement plans contributions (1,063) (1,061)
Accrued income taxes (9,085) (376)
Net cash (used for) provided by operating activities (36,494) 11,169
Cash flows from investing activities:    
Purchases of property, plant and equipment (22,547) (27,074)
Purchases of marketable securities (124,514) (80,095)
Proceeds from maturities of marketable securities 119,552 46,549
Proceeds from sales of marketable securities 21,694 6,256
Net cash used for investing activities (5,815) (54,364)
Cash flows from financing activities:    
Issuance of common stock under employee stock option and stock purchase plans 8,921 9,925
Payments of long-term debt   (1,246)
Payments of contingent consideration (313) (5,824)
Net cash provided by financing activities 8,608 2,855
Decrease in cash and cash equivalents (33,701) (40,340)
Cash and cash equivalents at beginning of period 338,920 573,736
Cash and cash equivalents at end of period $ 305,219 $ 533,396