Debt (Narrative) (Details)						12 Months Ended
	Jan. 18, 2024 USD ($)	Apr. 19, 2023 USD ($)	Dec. 19, 2022	Jun. 02, 2021 USD ($)	Jun. 18, 2020 USD ($) $ / shares	Dec. 31, 2023 USD ($) tradingDay businessDay	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 01, 2017 USD ($)	Dec. 31, 2015	Apr. 30, 2014
Line of Credit Facility [Line Items]
Debt						$ 312,045,000	$ 314,779,000
Payments of debt issuance costs						249,000	0	$ 2,219,000
Interest expense						$ 25,299,000	18,224,000	16,887,000
Interest Expense
Line of Credit Facility [Line Items]
Payments of debt issuance costs				$ 361,000
Debt extinguishment costs				474,000
Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed					4.25%
Effective interest rate						5.05%
Debt instrument, face amount					$ 100,000,000
Proceeds from convertible debt					$ 96,500,000
Conversion ratio					0.0426203
Conversion price (in dollars per share) | $ / shares					$ 23.46
Debt fair value						$ 106,400,000
Interest expense						5,000,000	4,900,000	$ 4,900,000
Unamortized debt issuance costs						1,100,000	1,900,000
Convertible Senior Notes | Cumulative Effect, Period of Adoption, Adjustment | ASU 2020-06
Line of Credit Facility [Line Items]
Notes payable						$ 100,000,000
Convertible Senior Notes | Subsequent Event
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed	4.25%
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%
2.45% Sparkasse Zollernalb (KFW Loan 1)
Line of Credit Facility [Line Items]
Debt						$ 61,000	296,000
Interest rate on amounts borrowed						2.45%					2.45%
1.40% Sparkasse Zollernalb (KFW Loan 2)
Line of Credit Facility [Line Items]
Debt						$ 484,000	733,000
Interest rate on amounts borrowed						1.40%				1.40%
Credit and Guaranty Agreement | Secured Debt | Subsequent Event
Line of Credit Facility [Line Items]
Proceeds from issuance of debt	$ 220,000,000
Debt instrument, face amount	$ 350,000,000
Notes Payable Issued For Prepayment Of Insurance Premiums | IPFS Corporation
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed		6.65%
Debt instrument, face amount		$ 3,600,000
Loan term		1 year
Notes Payable, Current						$ 1,000,000
Revolving Credit Facility And Term Loan
Line of Credit Facility [Line Items]
Payments of debt issuance costs				2,100,000
Amortization of the debt issuance costs				$ 1,800,000
Revolving Credit Facility And Term Loan | Credit Agreement
Line of Credit Facility [Line Items]
Debt									$ 255,000,000
Effective interest rate						8.97%
Debt instrument, extension period				2 years 6 months
Revolving Credit Facility And Term Loan | Amended Credit Agreement Two | Convertible Senior Notes
Line of Credit Facility [Line Items]
Interest rate on amounts borrowed						4.25%
Term Loan
Line of Credit Facility [Line Items]
Debt						$ 211,500,000	$ 213,750,000		225,000,000
Term Loan | SOFR
Line of Credit Facility [Line Items]
Credit facility margin			3.50%
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
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility aggregate commitments									$ 30,000,000
Revolving Credit Facility | SOFR | Minimum
Line of Credit Facility [Line Items]
Credit facility margin			4.00%
Revolving Credit Facility | SOFR | Maximum
Line of Credit Facility [Line Items]
Credit facility margin			4.25%