Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities:
Net income	$ 51,477,000	$ 1,151,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	444,000	249,000
Deferred income tax expense	5,385,000
Stock-based compensation	545,000	557,000
Changes in operating assets and liabilities:
Accounts receivable	804,000	(2,541,000)
Inventories	(19,000)	(140,000)
Prepaid expenses and other	(569,000)	(174,000)
Accounts payable	(557,000)	778,000
Accrued liabilities	(303,000)	105,000
Income tax payable	8,919,000
Accrued income taxes	353,000
Excess tax benefit from stock options	(2,300,000)
Deferred revenue	106,000	(501,000)
Net cash provided by (used in) operating activities	64,285,000	(516,000)
Investing Activities:
Purchases of property and equipment	(1,220,000)	(368,000)
Acquisition of selling arrangement	(4,000,000)
Purchases of investments		(3,800,000)
Proceeds from sale of investments	500,000	5,700,000
Net cash provided by (used in) investing activities	(4,720,000)	1,532,000
Financing Activities:
Proceeds from issuance of common stock, net	3,125,000	713,000
Excess tax benefit from stock options	2,300,000
Dividends paid	(31,335,000)
Repurchase of common stock, net	(14,921,000)	(469,000)
Net cash provided by (used in) financing activities	(40,831,000)	244,000
Increase in cash and cash equivalents	18,734,000	1,260,000
Cash and cash equivalents at beginning of period	13,196,000	8,797,000
Cash and cash equivalents at end of period	31,930,000	10,057,000
Supplemental disclosures for cash flow information:
Cash paid during periods for income taxes	17,746,000	62,000
Non-cash financing activities:
Cashless exercise of stock options and warrants	$ 800,000	$ 3,363,000