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Investments (Cost-Method Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 29, 2018 | Dec. 31, 2017
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Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | $ 21,130 |  | $ 32,710
Ownership percentage (percent) | 24.60% |  |
Cost Method Investee | Respicardia | Prepaid expenses and other current assets |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Outstanding loans | $ 500 |  |
Respicardia |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | 17,705 |  | 17,422
ImThera Medical, Inc. |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | 0 |  | 12,900
Rainbow Medical Ltd. |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | 1,140 |  | 1,172
MD Start II |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | 1,164 |  | 1,199
Highlife S.A.S. |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | 1,104 |  | 0
Equity method investments |  |  | 1,800
Ownership percentage (percent) |  | 17.50% |
Other |  |  |
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31) |  |  |
Cost method investments | $ 17 |  | $ 17

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