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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Operating activities:    
Net income $ 15,633 $ 9,962
Adjustments to reconcile net income to net cash provided by (used in) operating activities    
Depreciation and amortization 7,305 6,636
Loss on disposal of property and equipment   10
Impairment of intangible assets   523
GNU gain on sale of business assets   (250)
Deferred rent 3,650 1,316
Deferred income taxes (102) 230
Share-based compensation expenses 3,704 4,633
Accounts receivable allowances 884 1,746
Changes in operating assets and liabilities:    
Accounts receivable (9,391) (10,180)
Unbilled services (10,175) (15,533)
Prepaid expenses and other current assets, and other assets 1,417 6,505
Forgivable loans (14,716) 2,418
Incentive cash awards 2,367 956
Accounts payable, accrued expenses, and other liabilities (8,970) (1,181)
Net cash provided by (used in) operating activities (8,394) 7,791
Investing activities:    
Cash consideration paid for acquisitions   (16,163)
Purchases of property and equipment (13,379) (5,366)
GNU cash proceeds from sale of business assets   250
Net cash used in investing activities (13,379) (21,279)
Financing activities:    
Issuance of common stock, principally stock option exercises 1,387 2,950
Borrowings under revolving line of credit 30,161 11,500
Repayments under revolving line of credit (24,599) (11,500)
Tax withholding payments reimbursed by restricted shares (1,783) (703)
Cash paid on dividend equivalents (98) (25)
Cash dividends paid to shareholders (4,168) (3,529)
Repurchases of common stock (20,389) (19,528)
Distribution to noncontrolling interest (41)  
Net cash used in financing activities (19,530) (20,835)
Effect of foreign exchange rates on cash and cash equivalents (869) 1,692
Net decrease in cash and cash equivalents (42,172) (32,631)
Cash and cash equivalents at beginning of period 54,035 53,530
Cash and cash equivalents at end of period 11,863 20,899
Noncash investing and financing activities:    
Issuance of common stock for acquired business   3,044
Purchases of property and equipment not yet paid for 1,852 2,568
Purchases of property and equipment paid by a third party   1,640
Asset retirement obligations 217  
Supplemental cash flow information:    
Cash paid for income taxes 3,409 7,297
Cash paid for interest $ 380 $ 248