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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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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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