Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
SALES	$ 547,004	$ 451,931	$ 516,799
COST OF SALES	336,868	284,185	311,642
GROSS PROFIT	210,136	167,746	205,157
OPERATING EXPENSES:
Research and development	58,314	58,076	64,984
Selling, general and administrative	84,662	69,127	79,722
Amortization of intangible assets	6,142	5,696	3,852
Restructuring charges	46,395	7,473	7,348
Total operating expenses	195,513	140,372	155,906
OPERATING INCOME	14,623	27,374	49,251
Interest Expense	(320)
Investment Income, Interest		607	169
Other Income	(19)	1,825	1,048
Nonoperating Income (Expense)	(339)	2,432	1,217
Income from continuing operations before income taxes	14,284	29,806	50,468
Provision for income taxes	(17,802)	9,630	13,614
INCOME FROM CONTINUING OPERATIONS, NET OF INCOME TAXES	32,086	20,176	36,854
Income from discontinued operations, net of income taxes	0	405	(540)
NET INCOME	$ 32,086	$ 20,581	$ 36,314
Basic weighted-average common shares outstanding (in shares)	39,597	38,879	43,465
Diluted weighted-average common shares outstanding (in shares)	40,667	39,447	43,954
CONTINUING OPERATIONS:
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.81	$ 0.52	$ 0.85
Diluted earnings per share (in dollars per share)	$ 0.79	$ 0.51	$ 0.84
DISCONTINUED OPERATIONS
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.00	$ 0.01	$ (0.01)
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.00	$ 0.01	$ (0.01)
NET INCOME:
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.81	$ 0.53	$ 0.84
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.79	$ 0.52	$ 0.83