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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Total revenue $ 210,583 $ 193,360 $ 635,157 $ 582,309
Cost of goods sold 69,830 69,295 208,596 198,929
Gross profit 140,753 124,065 426,561 383,380
Selling, general and administrative 72,670 65,704 215,263 198,460
Research and Development Expense 19,442 15,300 57,160 45,859
Operating Expenses 92,112 81,004 272,423 244,319
Operating income 48,641 43,061 154,138 139,061
Non-operating income 1,028 287 4,080 1,319
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 49,669 43,348 158,218 140,380
Provision (benefit) for income taxes (7,457) 7,495 11,609 7,856
Net income 57,126 35,853 146,609 132,524
Net income 57,126 35,853 146,609 132,524
Cercacor Laboratories        
Operating Leases, Income Statement, Sublease Revenue 100 100 300 300
Payments for Royalties $ 3,000 $ 2,100 $ 7,500 $ 5,600