Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 241,548	$ 384,557
Short-term investments	340,332	192,234
Restricted cash	3,448	2,017
Accounts receivable, net	44,736	63,169
Inventories	64,107	59,807
Prepaid expenses and other current assets	32,895	32,155
Deferred income taxes	16,918	10,545
Total current assets	743,984	744,484
Property, plant and equipment at cost, net	96,949	98,302
Goodwill	55,828	55,828
Deferred income taxes	5,136	935
Intangible assets, net	19,263	20,974
Other assets	16,908	16,781
Total assets	938,068	937,304
Current liabilities:
Accounts payable	46,948	26,087
Accrued expenses and other current liabilities	59,176	74,260
Deferred revenue	17,294	9,380
Income taxes payable	112	2,292
Current portion of long-term debt	279	268
Total current liabilities	123,809	112,287
Deferred income taxes	7,168	7,137
Long-term debt	1,995	2,138
Other liabilities	4,779	4,530
Total liabilities	137,751	126,092
Equity:
Preferred stock, 500,000 shares authorized; no shares issued and outstanding
Common stock; $.01 par value; authorized 120,000,000 shares; 39,254,671 and 39,328,503 shares issued and outstanding in 2013 and 2012, respectively	393	393
Additional paid-in-capital	713,454	708,723
Retained earnings	81,971	96,123
Accumulated other comprehensive income	4,499	5,973
Total equity	800,317	811,212
Total liabilities and equity	$ 938,068	$ 937,304