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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Cash flows from operating activities:    
Net income $ 7,874 $ 4,382
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 639 637
Amortization expense 386 275
Amortization of debt issuance costs 23 25
Non-cash stock compensation expense 2,100 1,912
Provision (reversal) for doubtful accounts 111 (36)
Gain (loss) on foreign currency translation 173 (250)
Release of valuation allowance 1,469 2,743
Changes in assets and liabilities:    
Increase in accounts receivable and unbilled revenue (2,515) (4,746)
Increase in prepaid expenses and other assets (842) (415)
Increase in accounts payable 2,565 2,497
Decrease in accrued expenses and other liabilities (5,620) (4,118)
Increase (decrease) in income tax payable (1,487) (2,370)
Net cash provided by operating activities 4,876 536
Cash flows from investing activities:    
Purchases of property and equipment (1,634) (487)
Net cash used in investing activities (1,634) (487)
Cash flows from financing activities:    
Proceeds from borrowings 8,000 5,000
Repayment of borrowings (6,000) (5,000)
Dividends paid (4,023) (3,199)
Exercise of stock options 200  
Repurchases of common stock (4,071) (7,693)
Net cash used in financing activities (5,894) (10,892)
Effect of exchange rate on cash (8) (11)
Net decrease in cash and cash equivalents (2,660) (10,854)
Cash at beginning of period 19,710 23,503
Cash at end of period 17,050 12,649
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 7 2,399
Cash paid for interest $ 69 $ 13