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Business Acqusition Business Acquisition (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 11, 2019 | Jan. 04, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 242,444 | $ 202,307 | $ 212,820 | $ 202,064 | $ 222,555 | $ 190,117 | $ 197,154 | $ 186,567 | $ 859,634 | $ 796,392 | $ 763,520
SurgiQuestInc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  | $ 257,700 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  | $ 265,000 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 68,400
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 763,520
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,153
Subsequent Event [Member] | Buffalo Filter LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business | $ 365,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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