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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Cash flows from operating activities:    
Net income $ 28,417 $ 24,453
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,578 9,029
Loss on disposal of property and equipment 27 (351)
Goodwill and Intangible Asset Impairment 0 1,988
Stock-based compensation 10,016 9,669
Increase (Decrease) in Deferred Income Taxes 793 (662)
Tax benefit of excess stock based compensation deductions (2,707) (2,238)
Non-cash director deferred compensation 34 33
Changes in operating assets and liabilities - (use) source    
Accounts receivable (28,999) (24,614)
Unbilled revenue (323) (360)
Inventory (8,678) (11,888)
Other assets (5,407) 2,697
Accounts payable 4,943 4,129
Accrued expenses 2,859 (216)
Accrued compensation (7,836) 3,004
Deferred revenue and customer advances (2,376) (4,231)
Long term liabilities (467) 338
Net cash provided by operating activities (126) 10,780
Cash flows from investing activities:    
Additions of property and equipment (9,168) (5,309)
Payments for (Proceeds from) Other Investing Activities 0 2,000
Purchases of investments (24,214) (12,897)
Sales of investments 7,500 8,044
Proceeds from Sales of Assets, Investing Activities 0 650
Net cash used in investing activities (25,882) (11,512)
Cash flows from financing activities:    
Proceeds from stock option exercises 7,853 12,364
Income tax withholding payment associated with restricted stock vesting (1,532) (909)
Tax benefit of excess stock-based compensation deductions 2,707 2,238
Net cash provided by financing activities 9,028 13,693
Net increase (decrease) in cash and cash equivalents (16,980) 12,961
Cash and cash equivalents, at beginning of period 165,404 126,770
Cash and cash equivalents, at end of period 148,424 139,731
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 15,462 7,062
Noncash investing activity, transfer of inventory to property and equipment 637 0
Noncash or Part Noncash Acquisition, Fixed Assets Acquired $ 671 $ 0