Debt (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 01, 2017
Line of Credit Facility [Line Items]
Term loan balance		$ 223,176	$ 225,953
Credit facility default interest rate		2.00%
Credit facility aggregate interest rate		5.19%
Credit facility commitment fee percentage		0.50%
Line of credit facility, percentage threshold of principal amount outstanding		25.00%
Interest expense		$ 14,900	15,800	$ 4,900
Term Loan [Member]
Line of Credit Facility [Line Items]
Term loan balance		220,500	222,750
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		1,061	1,318
Interest rate on amounts borrowed	2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Line of Credit Facility [Line Items]
Term loan balance		$ 1,615	$ 1,885
Interest rate on amounts borrowed	1.40%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments					$ 30,000
Credit facility maturity date		Dec. 01, 2022
Revolving Credit Facility [Member] | JOTEC [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments					30,000
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%
Secured Debt [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments					255,000
Secured Debt [Member] | JOTEC [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments					255,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Term loan balance					225,000
Term Loan [Member] | JOTEC [Member]
Line of Credit Facility [Line Items]
Term loan balance					$ 225,000
Credit facility maturity date		Dec. 01, 2024
Term Loan [Member] | JOTEC [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility margin		2.25%	3.00%
Term Loan [Member] | JOTEC [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility margin		3.25%	4.00%