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Acquisition Of JOTEC (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 01, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance |  | $ 228,969,000 | $ 227,442,000 | $ 227,442,000 | $ 228,969,000 |
Additional goodwill from JOTEC Acquisition |  |  |  | $ 1,359,000 |  |
JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Agreement date |  |  |  | Dec. 01, 2017 |  |
Acquisition price | $ 225,000,000 |  |  |  |  |
Total consideration | 221,869,000 |  |  |  |  |
Cash consideration | 168,800,000 |  |  |  |  |
Common shares issued |  |  |  |  | 2,682,754 |
Common stock value issued in business combination |  |  |  |  | $ 53,100,000 |
Escrow deposit, part of payments to acquire business | $ 22,500,000 |  |  |  |  |
Transaction and integration costs |  |  | 851,000 | $ 4,300,000 |  |
Revenues |  | 4,100,000 |  |  |  |
Net loss |  | (1,500,000) |  |  | $ (736,000) | $ (1,966,000)
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 | $ 53,100,000 |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance | 225,000,000 | $ 225,000,000 | $ 223,875,000 | $ 223,875,000 | $ 225,000,000 |
Term Loan [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan balance | 225,000,000 |  |  |  |  |
Senior Secured Credit Facility [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Credit facility aggregate commitments | 255,000,000 |  |  |  |  |
Revolving Credit Facility [Member] | JOTEC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Credit facility aggregate commitments | $ 30,000,000 |  |  |  |  |

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