Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss) including noncontrolling interests in operating subsidiaries	$ (66,662)us-gaap_ProfitLoss	$ (58,842)us-gaap_ProfitLoss	$ 59,289us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) including noncontrolling interests in operating subsidiaries to net cash provided by (used in) operating activities:
Depreciation and amortization	57,546	53,894	39,168
Non-cash stock compensation	18,115us-gaap_ShareBasedCompensation	27,894us-gaap_ShareBasedCompensation	25,657us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	0	1,398	(13,210)
Provision for deferred income taxes	(1,736)	(26,746)	9,889
Other	(28)	12	777
Changes in assets and liabilities:
Accounts receivable	(13,827)	3,502	(6,928)
Prepaid expenses and other assets	3,154	(5,300)	(1,294)
Accounts payable and accrued expenses / costs	3,718	2,740	2,255
Royalties and contingent legal fees payable	3,904	(2,061)	(11,000)
Net cash provided by (used in) operating activities	4,184	(3,509)	104,603
Cash flows from investing activities:
Purchase of property and equipment	(109)	(675)	(268)
Purchase of available-for-sale investments	(109,963)	(279,693)	(402,500)
Sale of available-for-sale investments	182,115	239,370	322,236
Purchase of ADAPTIX, Inc., net of cash acquired	0	0	(150,000)
Patent acquisition costs	(42,746)	(25,061)	(178,260)
Net cash provided by (used in) investing activities	29,297	(66,059)	(408,792)
Cash flows from financing activities:
Payments of Dividends	(25,039)us-gaap_PaymentsOfDividends	(18,633)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Distributions to noncontrolling interests in operating subsidiary	(867)us-gaap_PaymentsToMinorityShareholders	0us-gaap_PaymentsToMinorityShareholders	(312)us-gaap_PaymentsToMinorityShareholders
Proceeds from the exercise of stock options	206	486	340
Repurchases of common stock	0	(7,926)	(26,732)
Contributions from noncontrolling interests in operating subsidiary, net of issuance costs	0	1,920	5,793
Excess tax benefits from stock-based compensation	0	(1,398)	13,210
Proceeds from sale of common stock, net of issuance costs	0	0	218,961
Net cash provided by (used in) financing activities	(25,700)	(25,551)	211,260
Increase in cash and cash equivalents	7,781	(95,119)	(92,929)
Cash and cash equivalents, beginning	126,685	221,804	314,733
Cash and cash equivalents, ending	134,466	126,685	221,804
Patent acquisition costs included in accrued expenses	$ 16,700	$ 4,000	$ 0

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