Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 264,939	$ 270,408
Short-term investments	565,368	479,141
Accounts receivable (net of allowance for doubtful accounts of $5,317 and $3,774 at March 31, 2013 and December 31, 2012, respectively)	212,556	203,607
Deferred commissions	30,910	30,232
Prepaid expenses	18,990	14,344
Other current assets	24,825	21,065
Total current assets	1,117,588	1,018,797
Property and equipment, net	216,050	186,677
Goodwill	115,214	115,214
Intangible assets, net	29,939	32,780
Other assets	30,741	28,862
TOTAL ASSETS	1,509,532	1,382,330
CURRENT LIABILITIES:
Accounts payable	62,166	53,559
Accrued liabilities	88,974	104,077
Deferred revenue	317,088	257,743
Total current liabilities	468,228	415,379
DEFERRED TAX LIABILITIES	10,948	27,717
OTHER LONG TERM LIABILITIES	39,014	30,810
Total liabilities	518,190	473,906
COMMITMENTS AND CONTINGENCIES (Note 9)
STOCKHOLDERS’ EQUITY (Note 10):
Additional paid-in capital	939,604	879,303
Accumulated other comprehensive income	261	260
Accumulated earnings	51,466	28,850
Total stockholders’ equity	991,342	908,424
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,509,532	1,382,330
Class B Common Stock
STOCKHOLDERS’ EQUITY (Note 10):
Class A and Class B common stock	$ 11	$ 11