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Debt (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2018	Jun. 30, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 01, 2017
Line of Credit Facility [Line Items]
Term loan balance			$ 226,703,000		$ 226,703,000		$ 228,969,000
Credit facility default interest rate			2.00%		2.00%
Credit facility aggregate interest rate			6.39%		6.39%
Credit facility commitment fee percentage					0.50%
Line of credit facility, percentage threshold of principal amount outstanding					25.00%
Interest expense			$ 4,100,000	$ 851,000	$ 11,900,000	$ 2,500,000
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			1,401,000		1,401,000		1,657,000
Interest rate on amounts borrowed		2.45%
1.4% Sparkasse Zollernalb (KFW Loan 2) [Member]
Line of Credit Facility [Line Items]
Term loan balance			1,989,000		$ 1,989,000		2,312,000
Interest rate on amounts borrowed		1.40%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maturity date					Dec. 01, 2022
Credit facility outstanding balance			0		$ 0		0
Credit facility remaining availability			30,000,000		$ 30,000,000
Revolving Credit Facility [Member] | JOTEC [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments								$ 30,000,000
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] | JOTEC [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments								255,000,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Term loan balance			$ 223,313,000		$ 223,313,000		$ 225,000,000	225,000,000
Credit facility maturity date					Dec. 01, 2024
Term Loan [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility margin					3.00%
Term Loan [Member] | Base Rate [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility margin	2.25%
Term Loan [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility margin					4.00%
Term Loan [Member] | LIBOR [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility margin	3.25%
Term Loan [Member] | JOTEC [Member]
Line of Credit Facility [Line Items]
Term loan balance								$ 225,000,000

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Debt instrument, debt default, interest rate in addition if there is a default.

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Line of credit facility, percentage threshold of principal amount outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The effective interest rate at the end of the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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