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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income including noncontrolling interest $ 55,721 $ 61,938 $ 64,053
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:      
Depreciation and amortization 11,421 9,369 7,342
Share-based compensation 11,674 14,097 13,676
Loss on disposal of property and equipment 249 0 0
Provision for doubtful accounts 728 231 231
Benefit from deferred income taxes (8,613) (6,806) (3,217)
Income tax benefit from exercise of stock options granted prior to January 1, 2006 693 338 1,650
Excess tax deficit (benefit) from share-based compensation arrangements 1,308 748 (67)
Realized foreign exchange gain on forward contracts 0 (586) 0
Changes in operating assets and liabilities:      
Increase in accounts receivable (9,576) (10,130) (7,549)
(Increase) decrease in royalties receivable (170) (28) 4,898
(Increase) decrease in inventories (9,453) 539 (916)
Increase in deferred cost of goods sold (9,594) (409) (4,526)
(Increase) decrease in prepaid expenses (2,792) 186 (1,874)
(Increase) decrease in prepaid income taxes (1,660) 1,255 366
Decrease (increase) in other assets 2,206 (2,193) (1,502)
Increase (decrease) in accounts payable 968 (1,726) 5,159
Increase (decrease) in accrued compensation 4,557 4,827 (1,333)
Increase in accrued liabilities 6,406 2,939 2,515
(Decrease) increase in income taxes payable (381) 198 (89)
Increase (decrease) in deferred revenue 1,467 2,850 (921)
(Decrease) increase in other liabilities (842) (2,203) 1,061
Net cash provided by operating activities 54,317 75,434 78,957
Cash flows from investing activities:      
Purchases of property and equipment (9,090) (10,828) (5,057)
Increase in intangible assets (3,926) (3,664) (2,451)
Cash paid for acquisitions, net of cash acquired 0 (37,399) 0
Net cash used in investing activities (13,016) (51,891) (7,508)
Cash flows from financing activities:      
Repayments on capital lease obligations (132) (26) (50)
Proceeds from issuance of common stock 3,289 1,642 5,943
Excess tax (deficit) benefit from share-based compensation arrangements (1,308) (748) 67
Dividends paid 0 (57,275) 0
Repurchases of common stock (19,790) (26,268) (36,187)
Short swing profit recovery 0 0 73
Net proceeds from settlement of forward contracts 0 586 0
Net cash used in financing activities (17,941) (82,089) (30,154)
Effect of foreign currency exchange rates on cash 552 218 282
Net increase (decrease) in cash and cash equivalents 23,912 (58,328) 41,577
Cash and cash equivalents at beginning of period 71,554 129,882 88,305
Cash and cash equivalents at end of period 95,466 71,554 129,882
Cash paid for:      
Interest 28 44 116
Income taxes 29,979 28,691 22,823
Noncash investing and financing activities:      
Assets acquired under capital leases $ 352 $ 21 $ 0