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Condensed Consolidated Statements of Cash Flows - (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Operating activities:    
Net income $ 9,962 $ 12,157
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,636 5,848
Loss on disposal of property and equipment 10 3
Impairment of intangible assets 523  
GNU gain on sale of business assets (250) (3,836)
Deferred rent 1,316 3,250
Deferred income taxes 230 886
Share-based compensation expenses 4,633 4,791
Excess tax benefits from share-based compensation   (55)
Accounts receivable allowances 3,166 (247)
Changes in operating assets and liabilities:    
Accounts receivable (11,600) (3,627)
Unbilled services (15,533) (11,874)
Prepaid expenses and other current assets, and other assets 6,505 1,588
Forgivable loans 2,418 7,743
Incentive cash awards 956  
Accounts payable, accrued expenses, and other liabilities (1,181) (414)
Net cash provided by operating activities 7,791 16,213
Investing activities:    
Cash consideration paid for acquisitions (16,163)  
Purchases of property and equipment (5,366) (11,808)
GNU cash proceeds from sale of business assets 250 1,100
Net cash used in investing activities (21,279) (10,708)
Financing activities:    
Issuance of common stock, principally stock option exercises 2,950 1,448
Payments on notes payable   (75)
Borrowings under line of credit 11,500 7,500
Repayments under line of credit (11,500) (7,500)
Tax withholding payments reimbursed by restricted shares (703) (490)
Excess tax benefits from share-based compensation   55
Cash paid on dividend equivalents (25)  
Cash dividends paid to stockholders (3,529)  
Repurchases of common stock (19,528) (19,318)
Net cash used in financing activities (20,835) (18,380)
Effect of foreign exchange rates on cash and cash equivalents 1,692 (80)
Net decrease in cash and cash equivalents (32,631) (12,955)
Cash and cash equivalents at beginning of period 53,530 38,139
Cash and cash equivalents at end of period 20,899 25,184
Noncash investing and financing activities:    
Issuance of common stock for acquired business 3,044 44
Purchases of property and equipment not yet paid for 2,568 1,234
Purchases of property and equipment paid by a third party 1,640  
Asset retirement obligations   1,479
Supplemental cash flow information:    
Cash paid for income taxes 7,297 3,959
Cash paid for interest $ 248 $ 327