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Variable Interest Entity Variable Interest Entity (VIE) -Consolidating Statement of Operations (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Sales Revenue, Goods, Net $ 160,286,000 $ 144,603,000 $ 488,183,000 $ 439,572,000
Royalty 7,335,000 7,972,000 23,241,000 23,266,000
Total revenue 167,621,000 152,575,000 511,424,000 462,838,000
Cost of goods sold 57,499,000 50,343,000 171,954,000 154,600,000
Gross profit 110,122,000 102,232,000 339,470,000 308,238,000
Selling, general and administrative 57,845,000 59,607,000 184,244,000 182,072,000
Research and Development Expense 15,673,000 14,485,000 44,856,000 42,808,000
Operating Expenses 73,518,000 74,092,000 229,100,000 224,880,000
Operating Income (Loss) 36,604,000 28,140,000 110,370,000 83,358,000
Nonoperating Income (Expense) (546,000) (1,050,000) 423,000 (2,022,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 36,058,000 27,090,000 110,793,000 81,336,000
Provision for income taxes 8,285,000 9,161,000 25,420,000 24,889,000
Net income including noncontrolling interest 27,773,000 17,929,000 85,373,000 56,447,000
Net Income (Loss) Attributable to Noncontrolling Interest 0 1,396,000 0 2,752,000
Net Income (Loss) Attributable to Parent $ 27,773,000 19,325,000 $ 85,373,000 59,199,000
Parent Company [Member]        
Sales Revenue, Goods, Net   144,603,000   439,572,000
Royalty   7,972,000   23,266,000
Total revenue   152,575,000   462,838,000
Cost of goods sold   52,065,000   158,917,000
Gross profit   100,510,000   303,921,000
Selling, general and administrative   58,911,000   180,264,000
Research and Development Expense   12,103,000   37,587,000
Operating Expenses   71,014,000   217,851,000
Operating Income (Loss)   29,496,000   86,070,000
Nonoperating Income (Expense)   (1,050,000)   (2,022,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   28,446,000   84,048,000
Provision for income taxes   9,121,000   24,849,000
Net income including noncontrolling interest   19,325,000   59,199,000
Net Income (Loss) Attributable to Noncontrolling Interest     0
Net Income (Loss) Attributable to Parent   19,325,000   59,199,000
Cercacor Laboratories [Member]        
Sales Revenue, Goods, Net   0   0
Royalty   1,628,000   4,473,000
Total revenue   1,628,000   4,473,000
Cost of goods sold   0   0
Gross profit   1,628,000   4,473,000
Selling, general and administrative   602,000   1,964,000
Research and Development Expense   2,382,000   5,221,000
Operating Expenses   2,984,000   7,185,000
Operating Income (Loss)   (1,356,000)   (2,712,000)
Nonoperating Income (Expense)   574,000   574,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   (782,000)   (2,138,000)
Provision for income taxes   40,000   40,000
Net income including noncontrolling interest   (822,000)   (2,178,000)
Net Income (Loss) Attributable to Noncontrolling Interest   0   0
Net Income (Loss) Attributable to Parent   (822,000)   (2,178,000)
Cercacor Laboratories Inc Eliminations [Member]        
Sales Revenue, Goods, Net   0   0
Royalty   (1,628,000)   (4,473,000)
Total revenue   (1,628,000)   (4,473,000)
Cost of goods sold   (1,722,000)   (4,317,000)
Gross profit   94,000   (156,000)
Selling, general and administrative   94,000   (156,000)
Research and Development Expense   0   0
Operating Expenses   94,000   (156,000)
Operating Income (Loss)   0   0
Nonoperating Income (Expense)   (574,000)   (574,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   (574,000)   (574,000)
Provision for income taxes   0   0
Net income including noncontrolling interest   (574,000)   (574,000)
Net Income (Loss) Attributable to Noncontrolling Interest   1,396,000   2,752,000
Net Income (Loss) Attributable to Parent   822,000   2,178,000
Percentage of Revenue [Member]        
Sales Revenue, Goods, Net   0.948   0.950
Royalty   0   0
Total revenue   0   0
Cost of goods sold   0   0
Gross profit   0   0
Selling, general and administrative   0   0
Research and Development Expense   0   0
Operating Expenses   0   0
Operating Income (Loss)   0   0
Nonoperating Income (Expense)   0   0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   0   0
Provision for income taxes   0   0
Net income including noncontrolling interest   0   0
Net Income (Loss) Attributable to Noncontrolling Interest   0   0
Net Income (Loss) Attributable to Parent   0   0
Percentage of Revenue [Member] | Parent Company [Member]        
Sales Revenue, Goods, Net   0.948   0.950
Royalty   0   0
Total revenue   0   0
Cost of goods sold   0   0
Gross profit   0   0
Selling, general and administrative   0   0
Research and Development Expense   0   0
Operating Expenses   0   0
Operating Income (Loss)   0   0
Nonoperating Income (Expense)   0   0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   0   0
Provision for income taxes   0   0
Net income including noncontrolling interest   0   0
Net Income (Loss) Attributable to Noncontrolling Interest   (0.000)   (0.000)
Net Income (Loss) Attributable to Parent   $ 0   $ 0