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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Cash flows from operating activities:    
Net income including noncontrolling interest $ 27,577 $ 19,822
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:    
Depreciation and amortization 4,051 3,777
Stock-based compensation 3,027 2,894
Gain (Loss) on Disposition of Property Plant Equipment 152 58
Deconsolidation, Gain (Loss), Amount (273) 0
Provision for doubtful accounts 127 51
Provision for deferred income taxes 2,697 0
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (12,266) 2,777
Increase in inventories (326) (88)
Decrease in deferred cost of goods sold 1,799 208
Decrease (increase) in prepaid income taxes 353 (104)
Increase in other assets (621) (6,464)
Increase (decrease) in accounts payable 198 (3,053)
Increase (Decrease) in Accounts Payable, Related Parties (1,130) 0
Decrease in accrued compensation (12,634) (10,817)
(Decrease) increase in accrued liabilities (4,220) 7,183
Increase in income tax payable 4,513 866
Increase in deferred revenue 5,427 1,949
Increase in other liabilities 352 67
Net cash provided by operating activities 18,803 19,126
Cash flows from investing activities:    
Purchases of property and equipment, net (5,346) (17,218)
Increase in intangible assets (751) (737)
Deconsolidation, Variable Interest Entity, Reduction of Cash (763) 0
Net cash used in investing activities (6,860) (17,955)
Cash flows from financing activities:    
Proceeds from (Repayments of) Lines of Credit 45,000 (69)
Repayments of Lines of Credit (5,000) 0
Repayments of capital lease obligations (67) 0
Proceeds from issuance of common stock 2,552 4,612
Repurchases of common stock (47,699) (2,154)
Issuance of equity by noncontrolling interest, net of equity issued 0 3
Net cash (used in) provided by financing activities (5,214) 2,392
Effect of foreign currency exchange rates on cash 855 (2,296)
Net (decrease) increase in cash and cash equivalents 7,584 1,267
Cash and cash equivalents at beginning of period 132,317  
Cash and cash equivalents at end of period $ 139,901 $ 135,720