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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Sales Revenue, Goods, Net $ 202,004,000 $ 179,727,000 $ 406,393,000 $ 362,193,000
Total revenue 211,621,000 192,306,000 424,574,000 388,949,000
Cost of goods sold 69,474,000 65,405,000 138,766,000 129,634,000
Gross profit 142,147,000 126,901,000 285,808,000 259,315,000
Selling, general and administrative 71,418,000 66,670,000 142,593,000 132,756,000
Research and Development Expense 19,117,000 16,382,000 37,718,000 30,559,000
Operating Expenses 90,535,000 83,052,000 180,311,000 163,315,000
Operating income 51,612,000 43,849,000 105,497,000 96,000,000
Non-operating income 1,405,000 158,000 3,052,000 1,032,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 53,017,000 44,007,000 108,549,000 97,032,000
Provision (benefit) for income taxes 9,164,000 (1,131,000) 19,066,000 361,000
Net income including noncontrolling interest 43,853,000 45,138,000 89,483,000 96,671,000
Net income 43,853,000 45,138,000 89,483,000 96,671,000
Cercacor Laboratories        
Operating Leases, Income Statement, Sublease Revenue 100,000 100,000 200,000 200,000
Payments for Royalties $ 2,000,000.0 $ 1,900,000.0 $ 4,500,000.0 $ 3,500,000.0