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Consolidated Statements of Operations and Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Revenues:      
Products $ 568,317 $ 536,774 $ 719,002
Services 101,103 106,734 103,515
Total net revenues 669,420 643,508 822,517
Cost of revenues:      
Cost of products 337,464 310,485 387,445
Cost of service 65,382 63,544 60,084
Total cost of revenues 402,846 374,029 447,529
Gross profit 266,574 269,479 374,988
Research and development 63,570 60,118 61,033
Selling, general and administrative 142,014 127,185 128,015
Litigation    5,316   
Insurance reimbursement (1,071)      
Completed acquisition costs 171 1,258   
Restructuring 1,364 343   
Amortization of acquired intangible assets 2,139 1,036 1,015
Income from operations 58,387 74,223 184,925
Interest income 999 1,059 1,159
Interest expense 85 146 32
Income before income taxes 59,301 75,136 186,052
Provision for income taxes 23,525 27,107 56,321
Net income 35,776 48,029 129,731
Other comprehensive income:      
Changes in value of financial instruments designated as cash flow hedges, net of tax expense (1) 62 [1] 150 [1] 1,570 [1]
Foreign currency translation adjustments, net of tax of $0 for 2013, 2012 and 2011 (3,604) 1,664 129
Unrealized (loss) gain on investments, net of tax (benefit) expense (2) (40) [2] 31 [2] 133 [2]
Total comprehensive income $ 32,194 $ 49,874 $ 131,563
Net income per share:      
Basic $ 0.67 $ 0.91 $ 2.49
Diluted $ 0.67 $ 0.90 $ 2.45
Cash dividends paid per common share $ 0.64 $ 0.62 $ 0.60
Weighted average common shares outstanding:      
Basic 53,061,000 52,686,000 52,169,000
Diluted 53,481,000 53,234,000 52,847,000
[1] Tax expense was $551, $88 and $937 for the years ended December 31, 2013, 2012 and 2011, respectively.
[2] Tax (benefit) expense was $(355), $19 and $79 for the years ended December 31, 2013, 2012, and 2011, respectively.