CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Income (Unaudited) [Abstract]
NET SALES	$ 147,974	$ 91,766	$ 443,452	$ 302,219
COST OF GOODS SOLD	94,248	68,150	278,679	227,392
Gross profit	53,726	23,616	164,773	74,827
OPERATING EXPENSES
Selling, general and administrative	19,251	14,418	57,545	43,947
Acquisition related charge (credit)	702	31	2,124	(88)
Research and development	2,974	2,613	9,255	8,731
Restructuring - plant closure and severance	0	0	0	7
Operating Expenses, Total	22,927	17,062	68,924	52,597
INCOME FROM OPERATIONS	30,799	6,554	95,849	22,230
OTHER INCOME (EXPENSE):
Interest income	1,069	935	2,744	2,562
Interest expense	(1,721)	(1,518)	(4,838)	(4,713)
Gain (loss) on auction rate securities	0	0	0	(978)
Miscellaneous	1,081	(917)	1,671	493
Other Income (Expense), Total	429	(1,500)	(423)	(2,636)
INCOME BEFORE PROVISION FOR INCOME TAXES	31,228	5,054	95,426	19,594
PROVISION FOR INCOME TAXES	10,819	517	32,291	3,504
NET INCOME	$ 20,409	$ 4,537	$ 63,135	$ 16,090
BASIC INCOME PER SHARE (in dollars per share)	$ 0.83	$ 0.18	$ 2.55	$ 0.64
DILUTED INCOME PER SHARE (in dollars per share)	$ 0.82	$ 0.18	$ 2.52	$ 0.63
WEIGHTED AVERAGE SHARES OUTSTANDING:
BASIC (in shares)	24,556	24,960	24,764	25,329
DILUTED (in shares)	24,811	25,141	25,029	25,506