Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 230,263	$ 161,996
Short-term investments	163,149	173,166
Accounts receivable, net	180,680	187,060
Inventories, net	172,109	169,990
Prepaid expenses and other current assets	49,001	48,009
Deferred income taxes, net	33,393	27,479
Total current assets	828,595	767,700
Property and equipment, net	260,568	249,721
Goodwill	146,520	147,258
Intangible assets, net	82,310	93,913
Other long-term assets	25,558	26,177
Total assets	1,343,551	1,284,769
Current liabilities:
Accounts payable	56,614	65,080
Accrued compensation	25,189	29,978
Deferred revenue - current	96,117	90,714
Accrued expenses and other liabilities	17,627	34,373
Other taxes payable	29,808	24,811
Total current liabilities	225,355	244,956
Deferred income taxes	44,620	47,630
Liability for uncertain tax positions	23,572	20,920
Deferred revenue- long term	21,389	20,446
Other long-term liabilities	5,531	11,689
Total liabilities	320,467	345,641
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 and 180,000,000 shares authorized; 125,690,240 and 122,878,690 shares issued and outstanding, respectively	1,257	1,229
Additional paid-in capital	604,330	532,845
Retained earnings	414,947	404,210
Accumulated other comprehensive income	2,550	844
Total stockholders' equity	1,023,084	939,128
Total liabilities and stockholders' equity	$ 1,343,551	$ 1,284,769