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Segment Reporting and Foreign Operations - Operating Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 102,231 | $ 95,907 | $ 100,532 | $ 95,618 | $ 91,092 | $ 90,477 | $ 91,249 | $ 86,631 | $ 394,288 | $ 359,449 | $ 296,755
Operating expenses |  |  |  |  |  |  |  |  | 152,351 | 132,278 | 102,950
Goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 0 | 8,344
Operating income (loss) |  |  |  |  |  |  |  |  | 29,641 | 33,190 | 17,204
Total other expense - net |  |  |  |  |  |  |  |  | (2,023) | (315) | (416)
Income tax expense | 1,209 | 1,811 | 2,719 | 2,169 | 806 | 2,120 | 3,746 | 3,159 | 7,908 | 9,831 | 4,328
NET INCOME |  |  |  |  |  |  |  |  | 19,710 | 23,044 | 12,460
Cardiovascular Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 378,493 | 347,430 | 287,707
Operating expenses |  |  |  |  |  |  |  |  | 142,089 | 122,600 | 93,884
Goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 30,411 | 38,010 | 30,176
Endoscopy Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,795 | 12,019 | 9,048
Operating expenses |  |  |  |  |  |  |  |  | 10,262 | 9,678 | 9,066
Goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 0 | 8,344
Operating income (loss) |  |  |  |  |  |  |  |  | $ (770) | $ (4,820) | $ (12,972)

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