Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Royalty and license fees	$ 67,426	$ 93,334	$ 211,464	$ 218,883
Total revenues	67,426	93,334	211,464	218,883
Operating expenses:
Cost of revenues	62	125	370	228
Research, development and other related costs	8,551	8,914	23,781	25,404
Selling, general and administrative	10,912	11,820	33,032	36,171
Amortization expense	5,186	4,599	14,573	13,772
Litigation expense	2,938	5,821	10,961	22,986
Restructuring, impairment of long-lived assets and other charges	0	66	0	1,593
Total operating expenses	27,649	31,345	82,717	100,154
Operating income	39,777	61,989	128,747	118,729
Other income and expense, net	755	338	2,173	1,101
Income before taxes from continuing operations	40,532	62,327	130,920	119,830
Provision for (benefit from) income taxes	7,596	(40,357)	36,647	(18,795)
Income from continuing operations	32,936	102,684	94,273	138,625
Income (loss) from discontinued operations, net of tax	(437)	6,012	(68)	(5,260)
Net income	$ 32,499	$ 108,696	$ 94,205	$ 133,365
Income from continuing operations:
Basic (in dollars per share)	$ 0.64	$ 1.96	$ 1.81	$ 2.62
Diluted (in dollars per share)	0.63	1.93	1.78	2.59
Income (loss) from discontinued operations:
Basic (in dollars per share)	(0.01)	0.11	0.00	(0.10)
Diluted (in dollars per share)	(0.01)	0.11	0.00	(0.10)
Net income:
Basic (in dollars per share)	0.63	2.07	1.81	2.52
Diluted (in dollars per share)	0.62	2.04	1.78	2.49
Cash dividends declared per share (in dollars per share)	$ 0.20	$ 0.1	$ 0.60	$ 0.82
Weighted average number of shares used in per share calculations-basic	51,825	52,500	52,167	52,842
Weighted average number of shares used in per share calculations-diluted	52,514	53,286	52,992	53,519