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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
OPERATING ACTIVITIES:    
Net income $ 4,665 $ 4,886
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 2,611 2,223
Loss on disposal of property and equipment 5  
Deferred rent 35 1,896
Right-of-use asset amortization 2,209  
Deferred income taxes 21 (68)
Share-based compensation expenses 911 1,292
Accounts receivable allowances 48 452
Changes in operating assets and liabilities:    
Accounts receivable 5,742 2,958
Unbilled services (8,666) (8,672)
Prepaid expenses and other current assets, and other assets (2,162) 972
Forgivable loans (16,957) (16,045)
Incentive cash awards 1,214 684
Accounts payable, accrued expenses, and other liabilities (42,489) (31,117)
Lease liabilities (3,754)  
Net cash used in operating activities (56,567) (40,539)
INVESTING ACTIVITIES:    
Purchases of property and equipment (774) (3,248)
Net cash used in investing activities (774) (3,248)
FINANCING ACTIVITIES:    
Issuance of common stock, principally stock options exercises 1,526 535
Borrowings under revolving line of credit 39,000 10,000
Tax withholding payments reimbursed by shares (388) (1,783)
Cash paid on dividend equivalents (35) (98)
Cash dividends paid to shareholders (1,616) (1,423)
Repurchases of common stock (4,349) (7,230)
Net cash provided by financing activities 34,138 1
Effect of foreign exchange rates on cash and cash equivalents 133 603
Net decrease in cash and cash equivalents (23,070) (43,183)
Cash and cash equivalents at beginning of period 38,028 54,035
Cash and cash equivalents at end of period 14,958 10,852
Noncash investing and financing activities:    
Repurchases of common stock payable   1,095
Purchases of property and equipment not yet paid for 1,906 3,923
Asset retirement obligations   223
Right-of-use assets obtained in exchange for lease obligations 713  
Right-of-use assets related to the adoption of ASC 842 82,329  
Supplemental cash flow information:    
Cash paid for taxes 298 212
Cash paid for interest $ 59 $ 60