Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013
Cash flows from operating activities:
Net income	$ 31,458	$ 29,918
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	3,979	3,667
Amortization of premiums and accretion of discounts on short-term investments	660	165
Deferred rent	(170)	884
Provision for doubtful accounts	1,234	822
Stock-based compensation	10,585	10,832
Deferred income tax provision	(6,046)	(2,770)
Excess tax benefit from equity awards	(5,126)	(4,064)
Changes in operating assets and liabilities:
Accounts receivable	(13,343)	2,362
Prepaid expenses and other assets	(2,877)	(3,498)
Accounts payable and accrued liabilities	6,314	(521)
Accrued payroll and employee benefits	331	(3,469)
Deferred revenues	(923)	(510)
Net cash provided by operating activities	26,076	33,818
Cash flows from investing activities:
Capital expenditures	(3,906)	(4,593)
Purchase of short-term investments	(1,067)	(11,813)
Maturity of short-term investments	7,586	19,190
Net cash provided by investing activities	2,613	2,784
Cash flows from financing activities:
Excess tax benefit from equity awards	5,126	4,064
Payroll taxes for restricted stock units	(6,356)	(6,112)
Repurchase of common stock	(26,372)	(21,719)
Exercise of share-based payment awards	1,811	1,497
Dividends and dividend equivalents paid	(9,842)	(5,962)
Net cash used in financing activities	(35,633)	(28,232)
Effect of foreign currency exchange rates on cash and cash equivalents	(390)	109
Net (decrease) increase in cash and cash equivalents	(7,334)	8,479
Cash and cash equivalents at beginning of period	122,948	113,268
Cash and cash equivalents at end of period	$ 115,614	$ 121,747