Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net income	$ 53,198,000	$ 219,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	256,000	161,000
Deferred income tax expense	5,385,000
Stock-based compensation	372,000	402,000
Changes in operating assets and liabilities:
Accounts receivable	(195,000)	(1,700,000)
Inventories	(20,000)	(14,000)
Prepaid expenses and other	(618,000)	159,000
Accounts payable	(860,000)	92,000
Accrued liabilities	(164,000)	(307,000)
Income taxes payable	15,143,000
Accrued income taxes	353,000
Excess tax benefit	(2,240,000)
Deferred revenue	216,000	(525,000)
Net cash provided by (used in) operating activities	70,826,000	(1,513,000)
Investing Activities:
Purchases of property and equipment	(1,180,000)	(275,000)
Acquisition of selling arrangement	(4,000,000)
Purchases of investments		(2,600,000)
Proceeds from sale of investments	500,000	3,600,000
Net cash provided by (used in) investing activities	(4,680,000)	725,000
Financing Activities:
Proceeds from issuance of common stock, net	3,090,000	714,000
Excess tax benefit	2,240,000
Dividends paid	(31,335,000)
Repurchase of common stock, net	(13,049,000)	(474,000)
Net cash provided by (used in) financing activities	(39,054,000)	240,000
Increase (decrease) in cash and cash equivalents	27,092,000	(548,000)
Cash and cash equivalents at beginning of period	13,196,000	8,797,000
Cash and cash equivalents at end of period	40,288,000	8,249,000
Supplemental disclosures for cash flow information:
Cash paid during periods for income taxes	12,617,000	40,000
Non-cash financing activities:
Cashless exercise of options	$ 800,000