Condensed Consolidated Statements of Cash Flows (Unaudited) Statement (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 21,813	$ 256,272
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,063	19,213
Amortization of deferred financing fees and accretion of debt discount	7,222	6,806
Deferred revenue recognized	(135,187)	(155,344)
Increase (Decrease) in deferred revenue	187,276	29,220
Deferred income taxes	14,244	(2,256)
Share-based Compensation	2,608	4,637
Other than Temporary Impairment Losses, Investments	6,669	0
Other	638	154
Decrease (increase) in assets:
Receivables	102,482	(8,223)
Other current assets	(243)	(728)
Increase (decrease) in liabilities:
Accounts payable	(527)	8,338
Other accrued expenses	(19,337)	1,193
Accrued taxes payable	(2,228)	130,486
Net cash provided by operating activities	218,720	300,422
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	(292,906)	(267,737)
Sales of short-term investments	317,973	345,551
Purchases of property and equipment	(2,732)	(1,979)
Capitalized patent costs	(21,537)	(19,783)
Acquisition of patents	(13,013)	(13,750)
Long-term investments	(445)	0
Net cash used in investing activities	(12,660)	42,302
CASH FLOWS FROM FINANCING ACTIVITIES:
Noncontrolling Interest, Increase from Business Combination	6,376	0
Net proceeds from exercise of stock options	734	713
Payments on long-term debt, including capital lease obligations	0	(180)
Dividends paid	(8,233)	(13,388)
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	763	1,506
Repurchase of common stock	0	(152,694)
Net cash provided (used) by financing activities	(360)	(164,043)
NET INCREASE IN CASH AND CASH EQUIVALENTS	205,700	178,681
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	349,843	342,211
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 555,543