Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 03, 2015	Apr. 04, 2014
Cash flows from operating activities:
Net income	$ 10,333	$ 9,154
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	1,381	1,322
Amortization of premiums and accretion of discounts on short-term investments	213	225
Deferred rent	(145)	(99)
Provision for doubtful accounts	390	249
Stock-based compensation	5,221	5,293
Deferred income tax provision	(1,938)	(3,324)
Excess tax benefit from equity incentive plans	(4,431)	(4,499)
Changes in operating assets and liabilities:
Accounts receivable	(2,098)	(8,215)
Prepaid expenses and other assets	2,689	(4,988)
Accounts payable and accrued liabilities	4,553	8,167
Accrued payroll and employee benefits	(12,017)	(9,838)
Deferred revenues	(2,450)	433
Net cash provided by (used in) operating activities	1,701	(6,120)
Cash flows from investing activities:
Capital expenditures	(627)	(915)
Maturity of short-term investments	3,320	1,140
Net cash provided by investing activities	2,693	225
Cash flows from financing activities:
Excess tax benefit from equity incentive plans	4,431	4,499
Payroll taxes for restricted stock units	(7,267)	(6,267)
Repurchase of common stock	(3,500)	(6,831)
Exercise of share-based payment awards	289	329
Dividends and dividend equivalents rights	(4,023)	(3,310)
Net cash used in financing activities	(10,070)	(11,580)
Effect of foreign currency exchange rates on cash and cash equivalents	(156)	148
Net decrease in cash and cash equivalents	(5,832)	(17,327)
Cash and cash equivalents at beginning of period	129,490	122,948
Cash and cash equivalents at end of period	$ 123,658	$ 105,621