CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement Abstract
NET SALES	$ 826,846	$ 633,806	$ 635,251
COST OF GOODS SOLD	589,010	472,220	441,554
Gross profit	237,836	161,586	193,697
OPERATING EXPENSES
Selling, general and administrative	132,106	101,363	89,974
Research and development	48,302	33,761	27,231
Amortization of acquisition related intangible assets	8,078	5,122	4,503
Impairment of goodwill	5,318	0	0
Restructuring	1,535	0	0
Loss (gain) on sale of assets	216	(3,556)	0
Total operating expenses	195,555	136,690	121,708
Income from operations	42,281	24,896	71,989
OTHER INCOME (EXPENSES)
Interest income	1,274	778	1,024
Interest expense	(5,580)	(876)	(3,139)
Amortization of debt discount	0	0	(6,032)
Loss (gain) on securities carried at fair value	601	7,100	(1,039)
Other	9	(1,091)	861
Total other income (expenses)	(3,696)	5,911	(8,325)
Income before income taxes and noncontrolling interest	38,585	30,807	63,664
INCOME TAX PROVISION	14,481	4,825	10,157
NET INCOME	24,104	25,982	53,507
Less: NET (INCOME) LOSS attributable to noncontrolling interest	2,428	(1,830)	(2,770)
NET INCOME attributable to common stockholders	$ 26,532	$ 24,152	$ 50,737
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 0.57	$ 0.53	$ 1.12
Diluted	$ 0.56	$ 0.51	$ 1.09
Number of shares used in computation
Basic	46,363	45,780	45,202
Diluted	47,658	46,899	46,713