Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 379,589	$ 215,451
Short-term investments	321,524	326,218
Accounts receivable, less allowances of $1,750	29,734	33,632
Deferred tax assets	51,754	35,136
Prepaid and other current assets	10,850	9,119
Total current assets	793,451	619,556
NON-CURRENT ASSETS:
PROPERTY AND EQUIPMENT, NET	7,609	8,344
PATENTS, NET	134,099	130,305
DEFERRED TAX ASSETS	56,959	71,754
OTHER NON-CURRENT ASSETS, NET	47,904	44,684
Total non-current assets	246,571	255,087
TOTAL ASSETS	1,040,022	874,643
CURRENT LIABILITIES:
Current portion of long-term debt	301	288
Accounts payable	5,326	7,572
Accrued compensation and related expenses	9,231	22,933
Deferred revenue	132,962	134,804
Taxes payable	3,786	3,675
Divided payable	4,540	4,526
Other accrued expenses	8,634	4,762
Total current liabilities	164,780	178,560
NON-CURRENT LIABILITIES
Long-term Debt	188,822	180
LONG-TERM DEFERRED REVENUE	250,551	332,174
OTHER LONG-TERM LIABILITIES	14,228	10,613
TOTAL LIABILITIES	618,381	521,527
COMMITMENTS AND CONTINGENCIES
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, 68,968 and 68,602 shares issued and 45,398 and 45,032 shares outstanding	689	686
Additional paid-in capital	563,128	525,767
Retained earnings	427,027	395,799
Accumulated other comprehensive income	44	111
Stockholders' Equity before Treasury Stock	990,888	922,363
Treasury stock, 23,570 shares of common held at cost	569,247	569,247
Total shareholders’ equity	421,641	353,116
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,040,022	$ 874,643