Debt (Narrative) (Details) $ / shares in Units, $ in Thousands						1 Months Ended		12 Months Ended
	Dec. 19, 2022	Jun. 02, 2021	Jun. 18, 2020 USD ($) $ / shares	Apr. 29, 2020 USD ($)	Sep. 30, 2018	Oct. 31, 2018	Jun. 30, 2015	Dec. 31, 2022 USD ($) tradingDay businessDay	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 01, 2017 USD ($)
Line of Credit Facility [Line Items]
Debt								$ 314,779	$ 317,627
Credit facility default interest rate								2.00%
Credit facility commitment fee percentage								0.50%
Debt issuance costs								$ 0	2,219	$ 3,647
Proceeds from issuance of convertible debt								0	0	100,000
Interest expense								18,224	16,887	16,698
Interest Expense
Line of Credit Facility [Line Items]
Debt issuance costs								361
Debt extinguishment costs								474
Government Sponsored Debt
Line of Credit Facility [Line Items]
Loan term							9 years
2.45% Sparkasse Zollernalb (KFW Loan 1)
Line of Credit Facility [Line Items]
Debt								$ 296	566
Interest rate on amounts borrowed							2.45%	2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2)
Line of Credit Facility [Line Items]
Debt								$ 733	1,061
Interest rate on amounts borrowed							1.40%	1.40%
Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed			4.25%
Effective interest rate								5.05%
Face value			$ 100,000
Proceeds from issuance of convertible debt			$ 96,500
Conversion ratio			42.6203
Conversion price (in dollars per share) | $ / shares			$ 23.46
Debt fair value								$ 87,600
Interest expense								4,900		$ 4,200
Unamortized debt issuance costs								1,900
Convertible Senior Notes | Cumulative Effect, Period of Adoption, Adjustment | ASU 2020-06
Line of Credit Facility [Line Items]
Notes payable								$ 100,000
Convertible Senior Notes | Circumstance I
Line of Credit Facility [Line Items]
Conversion trading day threshold | tradingDay								20
Conversion consecutive trading day threshold | tradingDay								30
Conversion percentage of stock price threshold								130.00%
Convertible Senior Notes | Circumstance II
Line of Credit Facility [Line Items]
Conversion trading day threshold | businessDay								5
Conversion consecutive trading day threshold | tradingDay								5
Conversion percentage of stock price threshold								98.00%
Convertible Senior Notes | Circumstance After July 5, 2023
Line of Credit Facility [Line Items]
Conversion trading day threshold | tradingDay								20
Conversion consecutive trading day threshold | tradingDay								30
Conversion percentage of stock price threshold								130.00%
Conversion percentage of principal amount								100.00%
Revolving Credit Facility And Term Loan
Line of Credit Facility [Line Items]
Debt issuance costs								$ 2,100
Amortization of the debt issuance costs								$ 1,800
Revolving Credit Facility And Term Loan | Credit Agreement
Line of Credit Facility [Line Items]
Debt											$ 255,000
Effective interest rate								8.34%
Revolving Credit Facility And Term Loan | Amended Credit Agreement Two
Line of Credit Facility [Line Items]
Debt instrument, extension period		2 years 6 months
Revolving Credit Facility And Term Loan | Convertible Senior Notes | Amended Credit Agreement Two
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed								4.25%
Term Loan
Line of Credit Facility [Line Items]
Debt								$ 213,750	$ 216,000		225,000
Term Loan | Amended Credit Agreement Two | Circumstance I
Line of Credit Facility [Line Items]
Debt instrument, extension circumstance period								91 days
Term Loan | Amended Credit Agreement Two | Circumstance II
Line of Credit Facility [Line Items]
Debt instrument, extension circumstance period								182 days
Term Loan | Base Rate
Line of Credit Facility [Line Items]
Credit facility margin					3.00%	2.25%		2.25%
Term Loan | Base Rate | Amended Credit Agreement Two
Line of Credit Facility [Line Items]
Credit facility margin								2.50%
Term Loan | LIBOR
Line of Credit Facility [Line Items]
Credit facility margin					4.00%	3.25%		3.25%
Term Loan | LIBOR | Amended Credit Agreement Two
Line of Credit Facility [Line Items]
Credit facility margin								3.50%
Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Credit facility margin	3.50%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility aggregate commitments											$ 30,000
Line of credit facility, percentage threshold of principal amount outstanding						25.00%
Revolving Credit Facility | Amended Credit Agreement
Line of Credit Facility [Line Items]
First lien net leverage ratio				3.4
Minimum liquidity requirement				$ 12,000
Maximum percentage allowed for total principal amount of loans				25.00%
Maximum principal amount of loans outstanding				$ 7,500
Revolving Credit Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Credit facility margin						3.00%
Revolving Credit Facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility margin						4.00%
Revolving Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Credit facility margin	4.00%
Revolving Credit Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Credit facility margin						3.25%
Revolving Credit Facility | Maximum | LIBOR
Line of Credit Facility [Line Items]
Credit facility margin						4.25%
Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Credit facility margin	4.25%