Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 74,179	$ 68,648
Marketable securities, current portion	80,120	58,495
Accounts receivable, net of allowances of $781 and $783, respectively	54,880	54,518
Inventories, net	68,704	62,832
Income taxes receivable	3,262	4,627
Deferred income taxes	6,894	6,801
Prepaid expenses	12,119	14,384
Other current assets	13,084	12,695
Total current assets	313,242	283,000
Property, plant, and equipment, net	117,757	119,053
Goodwill	48,155	46,981
Other intangible assets, net	28,269	28,948
Marketable securities, non-current	13,482	25,429
Deferred income taxes, non-current	2,371	2,097
Other non-current assets	37,555	28,081
Total assets	560,831	533,589
Liabilities and stockholders' equity
Accounts payable	21,588	21,045
Accrued liabilities	5,508	5,918
Accrued salaries and related benefits	10,851	12,163
Income taxes payable	672	3,700
Other current liabilities	3,828	3,911
Total current liabilities	42,447	46,737
Deferred income taxes, non-current	12,451	10,245
Other non-current liabilities	19,341	18,182
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, par value $.01 per share: 2,000 shares authorized; none issued
Common stock, par value $.01 per share: 100,000 shares authorized; 39,865 and 39,640 issued and 31,676 and 31,495 outstanding in 2011 and 2010, respectively	398	396
Additional paid-in capital	440,730	435,840
Treasury stock at cost (8,189 and 8,145 shares in 2011 and 2010, respectively)	(231,096)	(230,272)
Retained earnings	267,574	248,433
Accumulated other comprehensive income	8,986	4,028
Total stockholders' equity	486,592	458,425
Total liabilities and stockholders' equity	$ 560,831	$ 533,589