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Acquisition Of JOTEC (Narrative) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 01, 2017 | Oct. 10, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance |  |  | $ 228,969 | $ 228,365 | $ 228,969 |
Additional goodwill from JOTEC Acquisition |  |  |  | $ 1,359 |  |
JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Agreement date |  |  |  | Dec. 01, 2017 |  |
Acquisition price |  | $ 225,000 |  |  |  |
Cash consideration | $ 168,800 |  |  |  |  |
Common shares issued |  |  |  |  | 2,682,754 |
Common stock value issued in business combination |  |  |  |  | $ 53,100 |
Escrow deposit, part of payments to acquire business | $ 22,500 |  |  |  |  |
Transaction and integration costs |  |  |  | $ 3,400 |  |
Revenues |  |  | 4,100 |  |  |
Net loss |  |  | (1,500) |  | $ (736) | $ (1,966)
Pro forma tax rate |  |  |  | 38.00% | 38.00% |
JOTEC [Member] | Common Stock [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common shares issued | 2,682,754 |  |  |  |  |
Common stock value issued in business combination | $ 53,100 |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance |  |  | $ 225,000 | $ 224,438 | $ 225,000 |
Term Loan [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance | 225,000 |  |  |  |  |
Senior Secured Credit Facility [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Credit facility aggregate commitments | 255,000 |  |  |  |  |
Revolving Credit Facility [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Credit facility aggregate commitments | $ 30,000 |  |  |  |  |

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