Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012
Cash flows from operating activities:
Net income	$ 18,824	$ 18,528
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	2,384	2,326
Amortization of premiums and accretion of discounts on short-term investments	137	289
Deferred rent	942	(208)
Provision for doubtful accounts	473	634
Stock-based compensation	8,331	7,184
Deferred income tax provision	(1,692)	(1,682)
Tax benefit for stock plans	(3,807)	(2,572)
Changes in operating assets and liabilities:
Accounts receivable	(1,558)	(6,431)
Prepaid expenses and other assets	(3,495)	3,006
Accounts payable and accrued liabilities	(43)	4,897
Accrued payroll and employee benefits	(5,175)	(5,420)
Deferred revenues	1,079	(1,128)
Net cash provided by operating activities	16,400	19,423
Cash flows from investing activities:
Capital expenditures	(3,701)	(1,942)
Purchase of short-term investments	0	(515)
Maturity of short-term investments	14,290	400
Sale of short-term investments	0	518
Net cash provided by (used in) investing activities	10,589	(1,539)
Cash flows from financing activities:
Tax benefit for stock plans	3,807	2,572
Payroll taxes for restricted stock units	(6,112)	(3,473)
Repurchase of common stock	(17,626)	(18,456)
Exercise of share-based payment awards	883	1,485
Dividends paid	(3,967)	0
Net cash used in financing activities	(23,015)	(17,872)
Effect of foreign currency exchange rates on cash and cash equivalents	(598)	(10)
Net increase in cash and cash equivalents	3,376	2
Cash and cash equivalents at beginning of period	113,268	84,439
Cash and cash equivalents at end of period	$ 116,644	$ 84,441