Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 239,548	$ 274,030
Short-term investments	203,721	197,163
Accounts receivable, net	190,992	202,329
Inventories, net	177,980	173,052
Prepaid expenses and other current assets	72,575	70,075
Deferred income taxes, net	31,406	31,171
Total current assets	916,222	947,820
Property and equipment, net	263,322	264,086
Goodwill	166,974	144,325
Intangible assets, net	75,421	78,282
Other long-term assets	21,120	20,978
Total assets	1,443,059	1,455,491
Current liabilities:
Accounts payable	57,671	58,603
Accrued compensation	23,656	33,774
Deferred revenue - current	109,300	105,964
Accrued expenses and other liabilities	12,930	14,714
Other taxes payable	31,589	34,602
Total current liabilities	235,146	247,657
Deferred income taxes	46,485	47,406
Liability for uncertain tax positions	10,256	10,127
Deferred revenue- long term	26,136	26,452
Other long-term liabilities	10,088	6,353
Total liabilities	328,111	337,995
Commitments and contingencies
Stockholders' equity:
Preferred stock: par value $0.01; 5,000,000 shares authorized; none issued and outstanding
Common stock: par value $0.01; 360,000,000 shares authorized; 128,147,815 shares and 127,849,271 shares issued and outstanding, respectively	1,281	1,278
Additional paid-in capital	680,228	662,889
Retained earnings	455,651	464,993
Accumulated other comprehensive loss	(22,212)	(11,664)
Total stockholders' equity	1,114,948	1,117,496
Total liabilities and stockholders' equity	$ 1,443,059	$ 1,455,491