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Acquisition Of On-X Life Technologies (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 20, 2016 | Dec. 22, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration |  |  | $ 409 | $ 1,226 |
Transaction and integration costs |  |  | $ 7,400 |  |
On-X Agreement [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Agreement date |  |  | Dec. 22, 2015 |  |
Acquisition price | $ 128,200 |  |  |  |
Close date |  |  | Jan. 20, 2016 |  |
Total purchase price |  |  | $ 128,217 |  |
Cash consideration | $ 93,600 |  |  |  |
Common shares issued | 3,703,699 |  |  |  |
Common stock consideration | $ 34,600 |  |  |  |
Escrow deposit, part of payments to acquire business | $ 10,000 |  |  |  |
Pro forma tax rate |  |  | 38.00% | 38.00% | 38.00%
Plan [Member] | On-X Agreement [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition price |  | $ 130,000 |  |  |

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