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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 17,913 $ 15,316
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 1,841 1,875
Amortization expense 1,475 825
Amortization of debt issuance costs 68 84
Non-cash stock compensation expense 7,588 6,467
Provision (reversal) for doubtful accounts 142 (11)
Loss (gain) on foreign currency translation 530 (566)
Release of valuation allowance 1,815 2,590
Changes in assets and liabilities:    
Increase in accounts receivable and unbilled revenue (4,935) (5,474)
Increase in prepaid expenses and other assets (1,172) (405)
Decrease in accounts payable (902) (2,090)
Decrease in accrued expenses and other liabilities (3,938) (10)
(Decrease) increase in income tax payable (1,474) 2,211
Net cash provided by operating activities 18,951 20,812
Cash flows from investing activities:    
Purchases of property and equipment (4,919) (2,068)
Cash consideration paid for acquisitions (9,268)  
Cash acquired in acquisitions 261  
Net cash used in investing activities (13,926) (2,068)
Cash flows from financing activities:    
Proceeds from ESPP 562 519
Proceeds from borrowings 26,000 30,000
Repayment of borrowings (11,000) (17,000)
Debt issuance costs   (237)
Dividends paid (8,670) (7,163)
Exercise of stock options 200  
Repurchase of common stock (15,598) (33,976)
Net cash used in financing activities (8,506) (27,857)
Effect of exchange rate on cash (3) (30)
Net decrease in cash and cash equivalents (3,484) (9,143)
Cash at beginning of period 19,710 23,503
Cash at end of period 16,226 14,360
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 3,696 4,473
Cash paid for interest 292 $ 187
Supplemental disclosure of non-cash acquisition financing activities:    
Shares issued to sellers of Jibe Consulting $ 3,600,000