Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities:
Net income (loss)	$ (2,073,000)	$ 53,198,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	567,000	256,000
Deferred income tax expense		5,385,000
Stock-based compensation expense	250,000	372,000
Changes in operating assets and liabilities:
Accounts receivable	62,000	(195,000)
Inventories	16,000	(20,000)
Income tax receivable	(922,000)
Prepaid expenses and other	322,000	(618,000)
Accounts payable	(270,000)	(860,000)
Accrued liabilities	(890,000)	(164,000)
Income tax payable	(748,000)	15,143,000
Accrued income taxes		353,000
Excess tax benefit from stock options		(2,240,000)
Deferred revenue	219,000	216,000
Net cash provided by (used in) operating activities	(3,467,000)	70,826,000
Investing Activities:
Purchases of property and equipment	(46,000)	(1,180,000)
Acquisition of selling arrangement		(4,000,000)
Proceeds from sale of investments		500,000
Net cash used in investing activities	(46,000)	(4,680,000)
Financing Activities:
Proceeds from issuance of common stock	131,000	3,090,000
Excess tax benefit from stock options		2,240,000
Dividends paid		(31,335,000)
Repurchase of common stock, net	(213,000)	(13,049,000)
Net cash used in financing activities	(82,000)	(39,054,000)
Increase (decrease) in cash and cash equivalents	(3,595,000)	27,092,000
Cash and cash equivalents at beginning of period	23,202,000	13,196,000
Cash and cash equivalents at end of period	19,607,000	40,288,000
Supplemental disclosures for cash flow information:
Cash paid for income taxes	790,000	12,617,000
Non-cash investing and financing activities:
Cashless exercise of stock options		$ 800,000