STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net (loss) income	$ (20,763)	$ 177,243	$ 683
Income and gain from discontinued operations	0	180,043	57,885
Loss from continuing operations	(20,763)	(2,800)	(57,202)
Adjustments to reconcile loss from continuing operations to net cash (used in) provided by operating activities:
Depreciation	5,336	5,811	6,915
Amortization and write-off of debt issuance costs	567	576	1,364
Stock-based compensation and employee stock purchase plan	3,139	6,869	7,861
(Gain) loss on sale of marketable securities	(240)	(589)	11
Other	1,600	2,590	(1,086)
Write-down and sale of property and equipment	0	1,082	232
Other-than-temporary impairment loss on investment	0	896	0
Gain on redemption of notes payable	0	0	(4,848)
Changes in operating assets and liabilities:
Decrease (increase) in other assets	3,506	644	(2,785)
(Decrease) increase in accounts payable	(2,620)	2,801	(361)
(Decrease) increase in accrued expenses and other liabilities	(3,250)	4,299	(1,709)
Net cash (used in) provided by operating activities of continuing operations	(12,725)	22,179	(51,608)
Net cash provided by operating activities of discontinued operations	0	436	66,605
Net cash (used in) provided by operating activities	(12,725)	22,615	14,997
Cash flows from investing activities:
Purchases of property and equipment	(630)	(1,967)	(1,987)
Proceeds from sale of fixed assets	4	0	0
Purchases of marketable securities	(263,061)	(2,834)	(109,791)
Proceeds from sales and maturities of marketable securities	104,448	86,306	91,958
Proceeds from sale of business, net	0	262,581	0
Net cash (used in) provided by investing activities of continuing operations	(159,239)	344,086	(19,820)
Net cash used in investing activities of discontinued operations	0	(105)	(6,327)
Net cash (used in) provided by investing activities	(159,239)	343,981	(26,147)
Cash flows from financing activities:
Repurchases of common stock	(120,793)	(48,170)	(2,015)
Retirement of notes payable	(5,000)	0	(15,602)
Proceeds from issuance of common stock	5,873	32,260	852
Withholding taxes – stock-based compensation	(1,155)	(3,443)	(1,107)
Redemptions from employee stock purchase plan, net	(167)	(153)	(249)
Net cash used in financing activities	(121,242)	(19,506)	(18,121)
Net (decrease) increase in cash and cash equivalents	(293,206)	347,090	(29,271)
Cash and cash equivalents at beginning of year	397,530	50,440	79,711
Cash and cash equivalents at end of year	$ 104,324	$ 397,530	$ 50,440