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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Operating activities:    
Net income $ 7,519 $ 503
Adjustments to reconcile net income to net cash used in operating activities, net of effect of acquired businesses:    
Depreciation and amortization 4,853 4,454
Loss on disposal of property and equipment 0 1,162
Deferred rent (1,594) (2,186)
Deferred income taxes 357 320
Share-based compensation expense 2,153 3,790
Excess tax benefits from share-based compensation (5) (38)
Accounts receivable allowances (328) 5,938
Changes in operating assets and liabilities:    
Accounts receivable (1,210) 6,077
Unbilled services (8,710) (9,994)
Prepaid expenses and other assets (19,375) (9,410)
Accounts payable, accrued expenses, and other liabilities (1,840) (23,418)
Net cash used in operating activities (18,180) (22,802)
Investing activities:    
Consideration relating to acquisitions, net (15,591) 0
Purchase of property and equipment (2,497) (1,856)
Purchase of investments 0 (9,494)
Sale of investments 0 23,989
Collections on notes receivable 14 939
Net cash provided by (used in) investing activities (18,074) 13,578
Financing activities:    
Issuance of common stock, principally stock option exercises 207 575
Borrowings under line of credit 17,320 0
Repayments under line of credit (17,320) 0
Payments on notes payable (700) (650)
Tax withholding payment reimbursed by restricted shares (227) (742)
Excess tax benefits from share-based compensation 5 38
Repurchase of common stock (631) (9,062)
Net cash used in financing activities (1,346) (9,841)
Effect of foreign exchange rates on cash and cash equivalents 51 (225)
Net decrease in cash and cash equivalents (37,549) (19,290)
Cash and cash equivalents at beginning of period 55,451 61,587
Cash and cash equivalents at end of period 17,902 42,297
Supplemental cash flow information:    
Cash paid for income taxes 1,337 8,724
Cash paid for interest $ 222 $ 167