Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 161,996	$ 142,608
Short-term investments	173,166	223,504
Accounts receivable, net	187,060	157,056
Inventories, net	169,990	131,995
Prepaid expenses and other current assets	48,009	38,082
Deferred income taxes, net	27,479	26,304
Total current assets	767,700	719,549
Property and equipment, net	249,721	190,148
Goodwill	147,258	130,747
Intangible assets, net	93,913	83,866
Other long-term assets	26,177	29,984
Total assets	1,284,769	1,154,294
Current liabilities:
Accounts payable	65,080	41,111
Accrued compensation	29,978	29,616
Deferred revenue - current	90,714	80,059
Accrued expenses and other liabilities	34,373	37,612
Other taxes payable	24,811	24,507
Total current liabilities	244,956	212,905
Deferred income taxes	47,630	43,186
Liability for uncertain tax positions	20,920	19,494
Deferred revenue - long-term	20,446	10,015
Other long-term liabilities	11,689	16,683
Total liabilities	345,641	302,283
Stockholders' equity:
Common stock: par value $0.01; 180,000,000 shares authorized; 122,878,690 and 120,677,143 shares issued and outstanding, respectively	1,229	1,207
Additional paid-in capital	532,845	471,830
Retained earnings	404,210	382,474
Accumulated other comprehensive income (loss)	844	(3,500)
Total stockholders' equity	939,128	852,011
Total liabilities and stockholders' equity	$ 1,284,769	$ 1,154,294