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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 02, 2016
Jun. 27, 2015
Cash flows from operating activities:    
Net income $ 8,746 $ 12,006
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,729 7,011
Loss on disposal of assets 182 24
Gain on sale of business unit (433) 0
Gain on sale of cost method investment (634) 0
Stock-based compensation 7,878 6,562
Deferred income taxes, net 1,602 825
Tax benefit of excess stock-based compensation deductions (776) (725)
Non-cash director deferred compensation 50 75
Changes in operating assets and liabilities - (use) source    
Accounts receivable 39,202 5,463
Unbilled revenue 198 1,729
Inventory 2,698 1,723
Other assets (7,432) (787)
Accounts payable (16,496) (12,096)
Accrued expenses (3,126) (3,136)
Accrued compensation (2,717) (4,816)
Deferred revenue and customer advances (211) (1,734)
Long term liabilities 164 (366)
Net cash provided by operating activities 35,624 11,758
Cash flows from investing activities:    
Additions of property and equipment (4,881) (5,539)
Change in other assets 428 1,015
Proceeds from sale of business unit 23,520 0
Purchases of investments (9,552) (14,180)
Sales of investments 8,000 13,000
Proceeds from sale of cost method investments 634 0
Net cash provided by (used in) investing activities 17,293 (7,734)
Cash flows from financing activities:    
Proceeds from stock option exercises 3,143 2,102
Income tax withholding payment associated with restricted stock vesting (1,264) (1,268)
Stock repurchases (97,021) (4,924)
Tax benefit of excess stock-based compensation deductions 776 725
Net cash used in financing activities (94,366) (3,365)
Net increase (decrease) in cash and cash equivalents (41,449) 659
Cash and cash equivalents, at beginning of period 179,915 185,957
Cash and cash equivalents, at end of period 138,466 186,616
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 8,619 5,845
Transfer of inventory to property and equipment 5 157
Additions of property and equipment included in accounts payable $ 812 $ 1,242