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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Sales Revenue, Goods, Net $ 182,802,000 $ 164,607,000 $ 360,899,000 $ 327,897,000
Royalty 10,131,000 8,029,000 18,336,000 15,906,000
Total revenue 192,933,000 172,636,000 379,235,000 343,803,000
Cost of goods sold 64,496,000 57,501,000 126,664,000 114,455,000
Gross profit 128,437,000 115,135,000 252,571,000 229,348,000
Selling, general and administrative 66,377,000 63,888,000 131,949,000 126,399,000
Research and Development Expense 15,192,000 14,818,000 30,559,000 29,183,000
Operating Expenses 81,569,000 78,706,000 162,508,000 155,582,000
Operating Income (Loss) 46,868,000 36,429,000 90,063,000 73,766,000
Nonoperating Income (Expense) 158,000 471,000 1,032,000 969,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 47,026,000 36,900,000 91,095,000 74,735,000
Provision for income taxes 346,000 6,877,000 (919,000) 17,135,000
Net income including noncontrolling interest 46,680,000 30,023,000 92,014,000 57,600,000
Net Income (Loss) Attributable to Parent 46,680,000 30,023,000 92,014,000 57,600,000
Cercacor Laboratories [Member]        
Operating Leases, Income Statement, Sublease Revenue   100,000 200,000 100,000
Payments for Royalties $ 1,900,000.0 $ 1,600,000.0 $ 3,500,000.0 $ 3,100,000.0