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Condensed Consolidated Statement of Income Statement - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Product $ 202,004 $ 179,727 $ 406,393 $ 362,193
Royalty and other revenue 9,617 12,579 18,181 26,756
Total revenue 211,621 192,306 424,574 388,949
Cost of goods sold 69,474 65,405 138,766 129,634
Gross profit 142,147 126,901 285,808 259,315
Selling, general and administrative 71,418 66,670 142,593 132,756
Research and development 19,117 16,382 37,718 30,559
Total operating expenses 90,535 83,052 180,311 163,315
Operating income 51,612 43,849 105,497 96,000
Non-operating income 1,405 158 3,052 1,032
Income before provision (benefit) for income taxes 53,017 44,007 108,549 97,032
Provision (benefit) for income taxes 9,164 (1,131) 19,066 361
Net income including noncontrolling interest 43,853 45,138 89,483 96,671
Net income 43,853 45,138 89,483 96,671
Foreign currency translation adjustments (2,785) 2,300 (3,056) 2,866
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 41,068 $ 47,438 $ 86,427 $ 99,537
Basic $ 0.84 $ 0.87 $ 1.72 $ 1.89
Diluted $ 0.79 $ 0.80 $ 1.60 $ 1.73
Basic 51,999 51,677 52,047 51,164
Diluted 55,742 56,173 55,842 55,868
As Previously Reported        
Product   $ 182,802   $ 360,899
Royalty and other revenue   10,131   18,336
Cost of goods sold   64,496   126,664
Selling, general and administrative   66,377   131,949
Provision (benefit) for income taxes   346   (919)
Net income   $ 46,680   $ 92,014
Basic   $ 0.90   $ 1.80
Diluted   $ 0.83   $ 1.65