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Segment Reporting And Foreign Operations Segment Reporting Operating Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net | $ 91,092 | $ 90,477 | $ 91,249 | $ 86,631 | $ 81,203 | $ 73,172 | $ 74,948 | $ 67,432 | $ 359,449 | $ 296,755 | $ 257,462
Operating Expenses |  |  |  |  |  |  |  |  | 132,278 | 111,294 | 75,955
Operating Expense, Excluding Goodwill Impairment Charge |  |  |  |  |  |  |  |  |  | 102,950 |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 8,344 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  | 33,190 | 17,204 | 32,847
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  | (315) | (416) | 247
Income Tax Expense (Benefit) | 806 | 2,120 | 3,746 | 3,159 | 921 | (1,539) | 3,124 | 1,822 | 9,831 | 4,328 | 10,564
Net Income |  |  |  |  |  |  |  |  | 23,044 | 12,460 | 22,530
Cardiovascular Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 347,430 | 287,707 | 249,800
Operating Expenses |  |  |  |  |  |  |  |  | 122,600 | 93,884 | 69,097
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  | 38,010 | 30,176 | 35,836
Endoscopy Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 12,019 | 9,048 | 7,662
Operating Expenses |  |  |  |  |  |  |  |  | 9,678 | 9,066 | 6,858
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 8,344 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  | $ (4,820) | $ (12,972) | $ (2,989)

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