Debt (Narrative) (Details)				3 Months Ended
	Jun. 02, 2021 USD ($)	Jun. 01, 2021	Jun. 18, 2020 USD ($) $ / shares	Mar. 31, 2022 USD ($) item	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 01, 2017 USD ($)
Line of Credit Facility [Line Items]
Interest expense				$ 3,900,000	$ 4,000,000.0
Long-term debt				$ 308,854,000		$ 309,123,000
Interest Expense [Member]
Line of Credit Facility [Line Items]
Debt issuance costs	$ 361,000
Debt extinguishment costs	474,000
Amended Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, percentage repaid for no covenants				25.00%
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member]
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed				2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed				1.40%
Convertible Senior Notes [Member]
Line of Credit Facility [Line Items]
Face value			$ 100,000,000.0
Interest rate on amounts borrowed			4.25%
Maturity date				Jul. 01, 2025
Proceeds from issuance of convertible debt			$ 96,500,000
Conversion ratio			42.6203
Conversion principal amount			$ 1,000
Conversion price | $ / shares			$ 23.46
Debt fair value				$ 116,500,000
Effective interest rate				5.05%
Interest expense				$ 1,200,000	$ 1,200,000
Unamortized debt issuance costs				$ 2,400,000
Convertible Senior Notes [Member] | Circumstance I [Member]
Line of Credit Facility [Line Items]
Conversion trading day threshold | item				20
Conversion consecutive trading day threshold | item				30
Conversion percentage of stock price threshold				130.00%
Convertible Senior Notes [Member] | Circumstance II [Member]
Line of Credit Facility [Line Items]
Conversion principal amount				$ 1,000
Conversion trading day threshold | item				5
Conversion consecutive trading day threshold | item				5
Conversion percentage of stock price threshold				98.00%
Convertible Senior Notes [Member] | Circumstance After July 5, 2023 [Member]
Line of Credit Facility [Line Items]
Conversion trading day threshold | item				20
Conversion consecutive trading day threshold | item				30
Conversion percentage of stock price threshold				130.00%
Conversion percentage of principal amount				100.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments							$ 30,000,000.0
Secured Debt [Member]
Line of Credit Facility [Line Items]
Credit facility aggregate commitments							$ 255,000,000.0
Term Loan [Member] | Amended Credit Agreement Two [Member] | Circumstance I [Member]
Line of Credit Facility [Line Items]
Debt instrument, extension circumstance period				91 days
Term Loan [Member] | Amended Credit Agreement Two [Member] | Circumstance II [Member]
Line of Credit Facility [Line Items]
Debt instrument, extension circumstance period				182 days
Term Loan [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility margin		2.25%
Term Loan [Member] | Base Rate [Member] | Amended Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
Credit facility margin				2.50%
Term Loan [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility margin		3.25%
Term Loan [Member] | LIBOR [Member] | Amended Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
Credit facility margin				3.50%
Revolving Credit Facility And Term Loan [Member]
Line of Credit Facility [Line Items]
Debt issuance costs	2,100,000
Amortization of the debt issuance costs	$ 1,800,000
Revolving Credit Facility And Term Loan [Member] | Amended Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
Debt instrument, extension period	2 years 6 months
Revolving Credit Facility And Term Loan [Member] | Convertible Senior Notes [Member] | Amended Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed				4.25%
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Convertible Senior Notes [Member]
Line of Credit Facility [Line Items]
Long-term debt				$ 100,000,000.0