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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Sales Revenue, Goods, Net $ 181,271,000 $ 160,286,000 $ 542,170,000 $ 488,183,000
Royalty and other revenue   7,335,000   23,241,000
Total revenue 193,692,000 167,621,000 572,927,000 511,424,000
Cost of goods sold 65,027,000 57,499,000 191,692,000 171,954,000
Gross profit 128,665,000 110,122,000 381,235,000 339,470,000
Selling, general and administrative 65,390,000 57,845,000 197,339,000 184,244,000
Research and Development Expense 15,300,000 15,673,000 45,859,000 44,856,000
Operating Expenses 80,690,000 73,518,000 243,198,000 229,100,000
Operating income 47,975,000 36,604,000 138,037,000 110,370,000
Non-operating income (expense) 287,000 (546,000) 1,319,000 423,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 48,262,000 36,058,000 139,356,000 110,793,000
Provision for income taxes 9,027,000 8,285,000 8,108,000 25,420,000
Net income including noncontrolling interest 39,235,000 27,773,000 131,248,000 85,373,000
Net Income (Loss) Attributable to Parent 39,235,000 27,773,000 131,248,000 85,373,000
Cercacor Laboratories [Member]        
Operating Leases, Income Statement, Sublease Revenue 100,000   300,000 200,000
Payments for Royalties $ 2,100,000.0 $ 1,600,000.0 $ 5,600,000.0 $ 4,700,000.0