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Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Cash flows from operating activities:    
Net income $ 34,049 $ 32,733
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 5,303 4,309
Depreciation of property, plant, and equipment 3,180 2,669
Amortization of intangible assets 2,086 2,130
Amortization of discounts or premiums on investments 3,582 2,996
Realized gain on sale of investments (1,071) (14)
Tax effect of stock option exercises (2,969) (2,425)
Change in deferred income taxes (1,076) (642)
Change in operating assets and liabilities (2,912) 6,309
Net cash provided by operating activities 40,172 48,065
Cash flows from investing activities:    
Purchases of investments (109,104) (168,165)
Maturities and sales of investments 242,952 114,817
Purchases of property, plant, and equipment (5,304) (3,625)
Net cash provided by (used in) investing activities 128,544 (56,973)
Cash flows from financing activities:    
Issuance of common stock under stock option plans 13,929 20,819
Payment of dividends (8,985) (7,096)
Tax effect of stock option exercises 2,969 2,425
Net cash provided by financing activities 7,913 16,148
Effect of foreign exchange rate changes on cash and cash equivalents (8,740) 2,233
Net change in cash and cash equivalents 167,889 9,473
Cash and cash equivalents at beginning of period 38,103 33,203
Cash and cash equivalents at end of period $ 205,992 $ 42,676