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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 120,016 | $ 115,210 | $ 109,875 | $ 103,948 | $ 102,231 | $ 95,907 | $ 100,532 | $ 95,618 | $ 449,049 | $ 394,288 | $ 359,449
Operating expenses |  |  |  |  |  |  |  |  | 166,523 | 152,351 | 132,278
Impairment of goodwill |  |  |  |  |  |  |  |  | 8,089 |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 27,844 | 29,641 | 33,190
Total other expense - net |  |  |  |  |  |  |  |  | (8,005) | (2,023) | (315)
Income tax expense | 1,642 | 833 | 1,253 | (459) | 1,209 | 1,811 | 2,719 | 2,169 | 3,269 | 7,908 | 9,831
NET INCOME |  |  |  |  |  |  |  |  | 16,570 | 19,710 | 23,044
Cardiovascular Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 432,124 | 378,493 | 347,430
Operating expenses |  |  |  |  |  |  |  |  | 157,479 | 142,089 | 122,600
Operating income (loss) |  |  |  |  |  |  |  |  | 26,597 | 30,411 | 38,010
Endoscopy Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 16,925 | 15,795 | 12,019
Operating expenses |  |  |  |  |  |  |  |  | 9,044 | 10,262 | 9,678
Operating income (loss) |  |  |  |  |  |  |  |  | $ 1,247 | $ (770) | $ (4,820)

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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