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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Cash flows from operating activities:    
Net income $ 3,932 $ 4,754
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,375 3,561
Loss on disposal of assets 0 22
Stock-based compensation 3,892 3,107
Deferred income taxes, net (47) (102)
Tax benefit of excess stock-based compensation deductions (267) (560)
Non-cash director deferred compensation 33 38
Changes in operating assets and liabilities - (use) source    
Accounts receivable 69,879 33,351
Unbilled revenue 185 1,981
Inventory (3,167) (1,998)
Other assets (2,985) 203
Accounts payable (20,626) (21,835)
Accrued expenses (2,673) (4,374)
Accrued compensation (4,055) (8,430)
Deferred revenue and customer advances 1,144 (2,080)
Long term liabilities 3 83
Net cash provided by operating activities 48,623 7,721
Cash flows from investing activities:    
Additions of property and equipment (2,390) (4,445)
Change in other assets 523 515
Purchases of investments 0 (3,541)
Sales of investments 2,500 2,500
Net cash used in investing activities (413) (6,001)
Cash flows from financing activities:    
Proceeds from stock option exercises 837 1,466
Income tax withholding payment associated with restricted stock vesting (1,218) (1,118)
Stock repurchases (12,021) (4,924)
Tax benefit of excess stock-based compensation deductions 267 560
Net cash used in financing activities (12,135) (4,016)
Net increase (decrease) in cash and cash equivalents 36,075 (2,296)
Cash and cash equivalents, at beginning of period 179,915 185,957
Cash and cash equivalents, at end of period 215,990 183,661
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 4,896 1,040
Transfer of inventory to property and equipment 5 157
Additions of property and equipment included in accounts payable $ 413 $ 480