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Consolidated Statements of Operations and Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net revenues:        
Products $ 139,846 $ 114,647 $ 388,998 $ 427,986
Services 26,607 26,800 76,028 81,726
Total net revenues 166,453 141,447 465,026 509,712
Cost of revenues:        
Cost of products 87,809 68,304 237,590 243,950
Cost of services 16,410 16,572 48,542 48,884
Total cost of revenues 104,219 84,876 286,132 292,834
Gross profit 62,234 56,571 178,894 216,878
Research and development 15,257 14,136 47,318 45,911
Selling, general and administrative 33,158 29,661 102,140 96,332
Litigation    5,316    5,316
Insurance reimbursement      (1,071)  
Completed acquisition costs    851 171 1,258
Restructuring 1,126   1,364  
Amortization of intangible assets 361 215 1,537 453
Income from operations 12,332 6,392 27,435 67,608
Interest income 221 299 760 760
Interest expense 13 32 50 92
Income before income taxes 12,540 6,659 28,145 68,276
Provision for income taxes 10,082 4,079 12,606 24,356
Net income 2,458 2,580 15,539 43,920
Other comprehensive income:        
Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense (891) [1] (417) [1] 185 [1] (297) [1]
Foreign currency translation adjustments, net of tax of $0 for the three and nine months ended September 30, 2013 and 2012 5,593 6,007 (3,582) 1,955
Unrealized gain (loss) on investments, net of tax expense (benefit) 48 [2] 70 [2] (13) [2] 3 [2]
Total comprehensive income $ 7,208 $ 8,240 $ 12,129 $ 45,581
Net income per share:        
Basic $ 0.05 $ 0.05 $ 0.29 $ 0.83
Diluted $ 0.05 $ 0.05 $ 0.29 $ 0.82
Cash dividends per common share $ 0.16 $ 0.16 $ 0.48 $ 0.46
Weighted average common shares outstanding:        
Basic 53,165 52,854 52,998 52,679
Diluted 53,513 53,290 53,410 53,240
[1] (1) Tax (benefit) was $(491) and $(260) for the three months ended September 30, 2013 and 2012, respectively. Tax expense (benefit) was $161 and $(177) for the nine months ended September 30, 2013 and 2012, respectively.
[2] (2) Tax expense was $26 and $44 for the three months ended September 30, 2013 and 2012, respectively. Tax (benefit) expense was $(11) and $2 for the nine months ended September 30, 2013 and 2012, respectively.