Condensed Consolidated Statements of Income (Unaudited) Statement (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
REVENUES	$ 69,873	$ 91,153	$ 148,331	$ 207,340
OPERATING EXPENSES:
Patent administration and licensing	16,756	14,707	32,704	32,530
Development	15,763	16,364	33,187	32,528
Selling, general and administrative	7,547	7,008	15,327	14,527
Total Operating Expenses	40,066	38,079	81,218	79,585
Income from operations	29,807	53,074	67,113	127,755
Interest and investment income, net	(3,381)	889	(4,323)	1,489
Income before income taxes	26,426	53,963	62,790	129,244
INCOME TAX PROVISION	(9,270)	(19,000)	(22,295)	(45,454)
NET INCOME	$ 17,156	$ 34,963	$ 40,495	$ 83,790
NET INCOME PER COMMON SHARE — BASIC	$ 0.38	$ 0.80	$ 0.89	$ 1.91
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC	45,369	43,971	45,338	43,794
NET INCOME PER COMMON SHARE — DILUTED	$ 0.37	$ 0.78	$ 0.88	$ 1.88
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED	45,843	44,706	45,858	44,546
CASH DIVIDEND DECLARED PER COMMON SHARE	$ 0.10	$ 0.00	$ 0.20	$ 0.00