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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Sales Revenue, Goods, Net $ 204,389,000 $ 182,466,000
Total revenue 212,953,000 196,643,000
Cost of goods sold 69,292,000 64,229,000
Gross profit 143,661,000 132,414,000
Selling, general and administrative 71,175,000 66,087,000
Research and Development Expense 18,601,000 14,176,000
Operating Expenses 89,776,000 80,263,000
Operating income 53,885,000 52,151,000
Non-operating income 1,647,000 874,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 55,532,000 53,025,000
Provision for income taxes 9,902,000 1,492,000
Net income including noncontrolling interest 45,630,000 51,533,000
Net income 45,630,000 51,533,000
Cercacor Laboratories [Member]    
Operating Leases, Income Statement, Sublease Revenue 100,000 100,000
Payments for Royalties $ 2,500,000.0 $ 1,600,000.0