CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 7,109	$ (1,800)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	159	2,568
Amortization and write-off of debt issuance costs	193	309
Stock-based compensation and employee purchase plan discount	(366)	982
(Gain) loss on sales of marketable securities	(320)	19
Losses on early retirement of notes payable	0	212
Amortization of purchase premium on marketable securities	731	1,556
(Gain) on sale of assets	(865)	0
Changes in operating assets and liabilities	(3,406)	(7,246)
Net cash provided by (used in) operating activities	3,235	(3,400)
Cash flows from investing activities:
Purchases of property and equipment	0	(4)
Proceeds from sale of assets	942	0
Proceeds from sales and maturities of marketable securities	115,894	83,276
Purchases of marketable securities	0	(105,540)
Net cash provided by (used in) investing activities	116,836	(22,268)
Cash flows from financing activities:
Common stock dividend	(69,970)	0
Repurchase of common stock	0	(5,318)
Retirement of notes payable	(115,849)	0
Repurchases of notes payable	0	(13,862)
Proceeds from issuance of common stock	12	62
Withholding taxes - stock based compensation	(123)	(76)
Withdrawals/proceeds from employee stock purchase plan	(33)	(21)
Net cash used in financing activities	(185,963)	(19,215)
Net increase (decrease) in cash and cash equivalents	(65,892)	(44,883)
Cash and cash equivalents at beginning of period	77,348	104,324
Cash and cash equivalents at end of period	$ 11,456	$ 59,441