Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2008	$ 708	$ 644,482	$ (384,129)	$ 1,676	$ 338,481	$ 601,218
Balance, shares treasury stock at Dec. 31, 2008			(19,381)
Balance, shares common stock at Dec. 31, 2008	70,738
Net income (loss)					(2,171)	(2,171)
Other comprehensive income, net of tax:
Currency translation adjustment				(59)
Market valuation of short-term investments				660
Other				11
Comprehensive income (loss)				612	(2,171)	(1,559)
Cumulative effect adjustment upon adoption of ASC 320-10-65-1 as of April 1, 2009				58	(58)
Repurchase in conjunction with our fair value stock option exchange		(167)				(167)
Restricted stock vested	7	(7)
Restricted stock vested, shares	761
Stock-based compensation		18,584				18,584
Stock repurchases			(101,489)			(101,489)
Stock repurchases, shares			(8,407)
Stock issued pursuant to ESPP	8	5,831				5,839
Stock issued pursuant to ESPP, shares	777
Balance at Dec. 31, 2009	723	668,723	(485,618)	2,346	336,252	522,426
Balance, shares treasury stock at Dec. 31, 2009			(27,788)
Balance, shares common stock at Dec. 31, 2009	72,276
Net income (loss)					7,487	7,487
Other comprehensive income, net of tax:
Currency translation adjustment				727
Market valuation of short-term investments				(100)
Other				(18)
Comprehensive income (loss)				609	7,487	8,096
Exercise of common stock options	1	1,021				1,022
Exercise of common stock options, shares	86
Restricted stock vested	13	(13)
Restricted stock vested, shares	1,344
Stock-based compensation		15,925				15,925
Stock repurchases			(2,941)			(2,941)
Stock repurchases, shares			(243)
Stock issued pursuant to ESPP	8	5,653				5,661
Stock issued pursuant to ESPP, shares	750
Tax benefit related to employee stock plans		1,595				1,595
Other					(35)	(35)
Balance at Dec. 31, 2010	745	692,904	(488,559)	2,955	343,704	551,749
Balance, shares treasury stock at Dec. 31, 2010			(28,031)			28,031
Balance, shares common stock at Dec. 31, 2010	74,456					74,456
Net income (loss)					27,465	27,465
Other comprehensive income, net of tax:
Currency translation adjustment				(1,292)
Market valuation of short-term investments				(148)
Other				(68)
Comprehensive income (loss)				(1,508)	27,465	25,957
Exercise of common stock options	2	1,986				1,988
Exercise of common stock options, shares	146
Restricted stock vested	13	(13)
Restricted stock vested, shares	1,317
Stock-based compensation		23,369				23,369
Stock repurchases			(45,841)			(45,841)
Stock repurchases, shares			(2,933)
Stock issued pursuant to ESPP	6	6,129				6,135
Stock issued pursuant to ESPP, shares	646
Tax benefit from employee stock plans		1,426				1,426
Balance at Dec. 31, 2011	$ 766	$ 725,801	$ (534,400)	$ 1,447	$ 371,169	$ 564,783
Balance, shares treasury stock at Dec. 31, 2011			(30,964)			30,964
Balance, shares common stock at Dec. 31, 2011	76,565					76,565