CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Interest revenue	$ 7,343	$ 8,966	$ 16,307	$ 19,500
Licenses Revenue	327	0	134	0
Total revenues	21,047	138,066	124,171	287,772
Operating expenses
General and administrative	6,951	7,429	16,797	15,095
Acquisition-related expenses	2,959	0	2,959	0
Total operating expenses	9,910	7,429	19,756	15,095
Operating income	11,137	130,637	104,415	272,677
Non-operating expense, net
Interest and other income, net	129	121	242	207
Interest expense	(4,461)	(7,199)	(9,011)	(15,809)
Total non-operating expense, net	(4,332)	(7,078)	(8,769)	(15,602)
Income before income taxes	6,805	123,559	95,646	257,075
Income tax expense	2,657	45,295	35,611	94,313
Net income	$ 4,148	$ 78,264	$ 60,035	$ 162,762
Net income per share
Basic (in Dollars per Share)	$ 0.03	$ 0.48	$ 0.37	$ 1.00
Net income per diluted share (in Dollars per Share)	$ 0.03	$ 0.47	$ 0.37	$ 0.97
Weighted average shares outstanding
Basic (in Shares)	163,791	163,544	163,729	163,188
Diluted (in Shares)	164,029	165,384	163,920	167,376
Cash dividends declared per common share (in Dollars per Share)	$ 0.05	$ 0.00	$ 0.10	$ 0.60
Queen et al. patents [Member]
Revenues
Royalty revenues	$ 14,232	$ 116,884	$ 135,687	$ 244,694
Acquired rights [Member]
Revenues
Royalty revenues	$ (855)	$ 12,216	$ (27,957)	$ 23,578