Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 190,179	$ 144,737
Accounts receivable, net	40,510	41,999
Inventories	24,748	20,693
Prepaid expenses	1,580	3,048
Prepaid income taxes	104	326
Deferred income taxes	1,020	593
Other current assets	321	513
Total current assets	258,462	211,909
Property, plant and equipment, net	54,784	52,725
Goodwill	28,515	28,515
Intangible assets with finite lives, net	16,104	18,858
Other assets	540	538
Total assets	358,405	312,545
Current liabilities:
Trade accounts payable	9,338	14,276
Accrued expenses	12,177	11,820
Accrued compensation and other benefits	3,613	4,138
Customer deposits and other deferred revenue	235	0
Total current liabilities	25,363	30,234
Deferred income taxes	6,385	5,868
Other long-term obligations	3,776	3,431
Total liabilities	35,524	39,533
Commitments and contingencies (note 12)
Stockholders' equity:
Preferred stock, $25 par value. Authorized 2,000,000 shares; none issued and outstanding	0	0
Common stock, $.0667 par value. Authorized 60,000,000 shares; 30,050,954 shares issued and outstanding at September 30, 2013 and 29,454,171 shares issued and outstanding at December 31, 2012	2,004	1,964
Additional paid-in capital	72,417	57,198
Retained earnings	248,736	214,609
Accumulated other comprehensive loss	(276)	(759)
Total stockholders' equity	322,881	273,012
Total liabilities and stockholders' equity	$ 358,405	$ 312,545