Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 368,799	$ 497,714
Short-term investments	363,893	200,737
Accounts receivable, less allowances of $1,750	134,176	92,830
Deferred tax assets	45,357	26,197
Prepaid and other current assets	47,768	40,036
Total current assets	959,993	857,514
NON-CURRENT ASSETS:
PROPERTY AND EQUIPMENT, NET	9,314	9,535
PATENTS, NET	268,414	206,371
DEFERRED TAX ASSETS	57,609	36,626
OTHER NON-CURRENT ASSETS, NET	2,064	3,137
Total non-current assets	337,401	255,669
TOTAL ASSETS	1,297,394	1,113,183
CURRENT LIABILITIES:
Accounts payable	31,661	24,504
Accrued compensation and related expenses	25,345	15,403
Deferred revenue	127,746	60,176
Taxes payable	11,550	7,056
Dividend payable	7,666	4,031
Other accrued expenses	13,721	15,268
Total current liabilities	217,689	126,438
LONG-TERM DEBT	215,502	208,813
NON-CURRENT LIABILITIES
LONG-TERM DEFERRED REVENUE	332,269	243,864
OTHER LONG-TERM LIABILITIES	1,692	248
TOTAL LIABILITIES	767,152	579,363
SHAREHOLDERS’ EQUITY:
Preferred Stock, $0.10 par value, 0 and 14,399 shares authorized 0 shares issued and outstanding	0	0
Common Stock, $0.01 par value, 100,000 shares authorized, 69,350 and 69,118 shares issued and 40,490 and 45,548 shares outstanding	698	696
Additional paid-in capital	611,251	598,325
Retained earnings	750,923	680,718
Accumulated other comprehensive income	(168)	(14)
Stockholders' Equity before Treasury Stock	1,362,704	1,279,725
Treasury stock, 25,957 and 23,570 shares of common held at cost	839,097	751,075
Total shareholders’ equity	523,607	528,650
Noncontrolling Interest in Variable Interest Entity	6,635	5,170
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	530,242	533,820
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,297,394	$ 1,113,183