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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Cash flows from operating activities:    
Net income $ 5,280 $ 8,355
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,142 3,284
Loss on disposal of property and equipment (10) 182
Stock-based compensation 3,078 2,929
Increase (Decrease) in Deferred Income Taxes 1,912 (449)
Tax benefit of excess stock based compensation deductions (2,231) (43)
Non-cash director deferred compensation 11 11
Changes in operating assets and liabilities - (use) source    
Accounts receivable 2,808 2,133
Unbilled revenue (75) (1,056)
Inventory 4,080 4,805
Other assets (3,588) (983)
Accounts payable (7,924) (12,711)
Accrued expenses (1,399) 379
Accrued compensation (11,862) (4,867)
Deferred revenue and customer advances (665) (2,628)
Long term liabilities (319) 815
Net cash provided by operating activities (7,762) 156
Cash flows from investing activities:    
Additions of property and equipment (2,177) (1,077)
Payments for (Proceeds from) Other Investing Activities 0 2,000
Purchases of investments (11,211) (2,547)
Sales of investments 2,500 1,000
Net cash used in investing activities (10,888) (4,624)
Cash flows from financing activities:    
Proceeds from stock option exercises 6,957 1,744
Income tax withholding payment associated with restricted stock vesting (1,118) (513)
Tax benefit of excess stock-based compensation deductions 2,231 43
Net cash provided by financing activities 8,070 1,274
Net decrease in cash and cash equivalents (10,580) (3,194)
Cash and cash equivalents, at beginning of period 165,404 126,770
Cash and cash equivalents, at end of period 154,824 123,576
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 3,284 1,510
Noncash investing activity, transfer of inventory to property and equipment 637 0
Noncash or Part Noncash Acquisition, Fixed Assets Acquired $ 1,373 $ 0