Consolidated Statements of Cash Flows Statement (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income including noncontrolling interests in operating subsidiaries	$ 49,653,000	$ 13,556,000
Adjustments to reconcile net income including noncontrolling interests in operating subsidiaries to net cash provided by operating activities:
Depreciation and amortization	5,158,000	3,794,000
Non-cash stock compensation	5,090,000	2,901,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	(10,237,000)	0
Gain on investments	0	(9,000)
Changes in assets and liabilities:
Accounts receivable	1,635,000	6,789,000
Prepaid expenses and other assets	(919,000)	(337,000)
Accounts payable and accrued expenses	2,692,000	782,000
Royalties and contingent legal fees payable	(9,413,000)	8,976,000
Increase (Decrease) in Deferred Income Taxes	5,293,000	0
Net cash provided by operating activities	48,952,000	36,452,000
Cash flows from investing activities:
Purchases of property and equipment	(24,000)	(59,000)
Purchase of available-for-sale investments	(144,762,000)	0
Sale of available-for-sale investments	20,000,000	35,000
Payments to Acquire Businesses, Net of Cash Acquired	(150,000,000)	0
Patent acquisition costs	(2,100,000)	(680,000)
Net cash used in investing activities	(276,886,000)	(704,000)
Cash flows from financing activities:
Proceeds from sale of common stock, net of issuance costs	219,084,000	175,284,000
Distributions to noncontrolling interests in operating subsidiary	0	(880,000)
Contributions from noncontrolling interests in operating subsidiary	1,920,000	877,000
Excess tax benefits from stock-based compensation	7,611,000	23,000
Proceeds from exercises of stock options	84,000	44,000
Net cash provided by (used in) financing activities	228,699,000	175,348,000
Increase in cash and cash equivalents	765,000	211,096,000
Cash and Cash Equivalents, beginning	314,733,000	102,515,000
Cash and Cash Equivalents, ending	$ 315,498,000	$ 313,611,000