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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Operating activities:    
Net income $ 11,725 $ 6,737
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,667 4,199
Impairment of intangible assets   510
GNU gain on sale of business assets   (250)
Deferred rent 3,695 1,202
Deferred income taxes 102 213
Share-based compensation expenses 2,438 3,052
Accounts receivable allowances 842 1,536
Changes in operating assets and liabilities:    
Accounts receivable (9,868) (5,260)
Unbilled services (4,965) (13,149)
Prepaid expenses and other current assets, and other assets 445 5,380
Forgivable loans (12,130) 4,612
Incentive cash awards 1,523 609
Accounts payable, accrued expenses, and other liabilities (31,275) (17,874)
Net cash used in operating activities (32,801) (8,483)
Investing activities:    
Cash consideration paid for acquisitions   (16,163)
Purchases of property and equipment (8,939) (2,650)
GNU cash proceeds from sale of business assets   250
Net cash used in investing activities (8,939) (18,563)
Financing activities:    
Issuance of common stock, principally stock option exercises 916 2,699
Borrowings under revolving line of credit 30,161 11,500
Repayments under revolving line of credit (8,802) (11,500)
Tax withholding payments reimbursed by restricted shares (1,783) (703)
Cash paid on dividend equivalents (98) (25)
Cash dividends paid to shareholders (2,795) (2,377)
Repurchases of common stock (20,389) (12,417)
Net cash used in financing activities (2,790) (12,823)
Effect of foreign exchange rates on cash and cash equivalents (480) 1,007
Net decrease in cash and cash equivalents (45,010) (38,862)
Cash and cash equivalents at beginning of period 54,035 53,530
Cash and cash equivalents at end of period 9,025 14,668
Noncash investing and financing activities:    
Issuance of common stock for acquired business   3,044
Repurchases of common stock payable   1,046
Purchases of property and equipment not yet paid for 4,704 841
Purchases of property and equipment paid by a third party   450
Asset retirement obligations 220  
Supplemental cash flow information:    
Cash paid for income taxes 1,158 5,229
Cash paid for interest $ 273 $ 170