Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 263,150	$ 285,283
Short-term investments	105,284	73,117
Accounts receivable, net	230,958	228,686
Inventories, net	186,155	193,608
Prepaid expenses and other current assets	52,568	53,953
Total current assets	838,115	834,647
Property and equipment, net	256,761	260,456
Goodwill	261,411	253,197
Intangible assets, net	120,327	108,663
Other long-term assets	28,700	39,601
Total assets	1,505,314	1,496,564
Current liabilities:
Accounts payable	54,214	48,800
Accrued compensation	36,672	27,743
Deferred revenue - current	120,212	115,577
Accrued expenses and other liabilities	15,341	32,997
Other taxes payable	28,743	34,958
Total current liabilities	255,182	260,075
Long-term debt	25,000	25,000
Deferred income taxes	35,561	45,386
Liability for uncertain tax positions	12,438	11,719
Deferred revenue- long term	31,665	29,752
Other long-term liabilities	7,420	10,413
Total liabilities	367,266	382,345
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; 130,493,232 shares and 129,202,979 shares issued and outstanding, respectively	1,305	1,292
Additional paid-in capital	800,774	771,346
Retained earnings	359,088	376,202
Accumulated other comprehensive loss	(23,119)	(34,621)
Total stockholders' equity	1,138,048	1,114,219
Total liabilities and stockholders' equity	$ 1,505,314	$ 1,496,564