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Shareholders' Equity (Narrative) (Details) - USD ($) | Dec. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017
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ASU 2016-09 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  |  | $ 141,000
ASU 606 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  | $ 215,000 |
Retained Earnings [Member] | ASU 2016-09 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  | (238,000) | (238,000)
Retained Earnings [Member] | ASU 606 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  | 215,000 |
Additional Paid In Capital [Member] | ASU 2016-09 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  | 379,000 | $ 379,000
Additional Paid In Capital [Member] | ASU 606 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  |  |
Deferred Tax Assets [Member] | ASU 2016-09 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative-effect adjustment |  | $ 141,000 |
Common Stock [Member] | JOTEC [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Common shares issued | 2,682,754 |  |
Common stock consideration | $ 53,100,000 |  |

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