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Debt (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 20, 2016 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 01, 2017 | Oct. 10, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  | $ 228,969,000 | $ 73,594,000 |  |  |
Credit facility aggregate interest rate |  |  | 5.36% | 3.50% |  |  |
Credit facility commitment fee percentage |  |  | 0.50% |  |  |  |
Credit facility default interest rate |  |  | 2.00% |  |  |  |
Interest expense |  |  | $ 4,900,000 | $ 3,000,000 | $ 62,000 |  |
Term Loan [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  | 225,000,000 | 73,594,000 |  |  |
Government Sponsored Debt [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Loan term |  | 9 years |  |  |  |  |
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  | 2,312,000 |  |  |  |
Interest rate on amounts borrowed |  | 2.45% |  |  |  |  |
1.4% Sparkasse Zollernalb (KFW Loan 2) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  | 1,657,000 |  |  |  |
Interest rate on amounts borrowed |  | 1.40% |  |  |  |  |
Amended Debt Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  | $ 0 | $ 67,000,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  | $ 30,000,000 | $ 30,000,000
Credit facility maturity date |  |  | Dec. 01, 2022 |  |  |  |
Revolving Credit Facility [Member] | On-X Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments | $ 20,000,000 |  |  |  |  |  |
Credit facility commitment fee percentage | 0.50% |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 3.00% |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 4.00% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 3.25% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 4.25% |  |  |  |
Senior Secured Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  | 255,000,000 |
Senior Secured Credit Facility [Member] | On-X Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments | $ 95,000,000 |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance |  |  |  |  |  | $ 225,000,000 | $ 225,000,000
Term Loan [Member] | On-X Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loan balance | 75,000,000 |  |  |  |  |  |
Term Loan [Member] | JOTEC [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility maturity date |  |  | Dec. 01, 2024 |  |  |  |
Term Loan [Member] | JOTEC [Member] | Base Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 3.00% |  |  |  |
Term Loan [Member] | JOTEC [Member] | LIBOR [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility margin |  |  | 4.00% |  |  |  |
Letter Of Credit Sub-Facility [Member] | On-X Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments | 4,000,000 |  |  |  |  |  |
Swing-Line Sub-Facility [Member] | On-X Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility aggregate commitments | $ 3,000,000 |  |  |  |  |  |

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