Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 421,512	$ 443,132
Short-term investments	206,085	185,783
Trade receivables, net of allowance for doubtful accounts of $2,968 and $3,040 at March 31, 2015 and December 31, 2014, respectively	169,096	169,400
Inventories	93,942	100,328
Deferred taxes	38,768	38,805
Prepaid expenses and other current assets	70,255	61,072
Total current assets	999,658	998,520
Property and equipment, net	107,134	109,195
Long-term investments	41,158	59,197
Goodwill	559,248	559,231
Purchased intangibles, net	21,474	24,567
Deferred taxes	49,091	54,019
Other assets	24,918	26,493
Total assets	1,802,681	1,831,222
Current liabilities
Accounts payable	107,118	108,172
Accrued payroll and related liabilities	31,616	42,901
Taxes payable	3,254	4,056
Deferred revenue	177,983	173,532
Current portion of long-term debt	6,250	6,250
Other accrued liabilities	81,961	86,193
Total current liabilities	408,182	421,104
Long-term deferred revenue	86,734	89,366
Taxes payable	11,846	11,719
Deferred taxes	164	173
Long-term debt	234,375	235,938
Other non-current liabilities	38,927	49,189
Total liabilities	780,228	807,489
Stockholders' equity
Common stock, $0.0005 par value; Authorized: 350,000,000 shares; Issued and outstanding: 135,054,538 shares at March 31, 2015 and 135,204,948 shares at December 31, 2014	68	68
Additional paid-in capital	1,151,324	1,155,829
Accumulated deficit	(137,059)	(136,275)
Accumulated other comprehensive income	8,120	4,111
Total stockholders' equity	1,022,453	1,023,733
Total liabilities and stockholders' equity	$ 1,802,681	$ 1,831,222