Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 208,747	$ 144,737
Accounts receivable, net of allowance for doubtful accounts of $115 at December 31, 2013 and 2012	39,386	41,999
Inventories	24,824	20,693
Prepaid expenses	2,580	3,048
Prepaid income taxes	899	326
Deferred income taxes	893	593
Other current assets	445	513
Total current assets	277,774	211,909
Property, plant and equipment, net	54,916	52,725
Goodwill	28,515	28,515
Intangible assets with finite lives, net	15,126	18,858
Other assets	541	538
Total assets	376,872	312,545
Current liabilities:
Trade accounts payable	12,395	14,276
Accrued expenses	10,732	11,820
Accrued compensation and other benefits	4,770	4,138
Dividends payable	7,856	0
Total current liabilities	35,753	30,234
Deferred income taxes	5,884	5,868
Other long-term obligations	3,877	3,431
Total liabilities	45,514	39,533
Commitments and contingencies (note 9)
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; 30,225,763 shares issued and outstanding at December 31, 2013 and 29,454,171 shares issued and outstanding at December 31, 2012	2,016	1,964
Additional paid-in capital	77,517	57,198
Retained earnings	251,627	214,609
Accumulated other comprehensive income (loss)	198	(759)
Total stockholders' equity	331,358	273,012
Total liabilities and stockholders' equity	$ 376,872	$ 312,545